A data obtained from a random sample has mean 68 and standard deviation 35. The value whose Z-score is 1.4 is Select one: O a. 69.4 O b. 19 O C 117
Q: A set of data items is normally distributed with a mean of 60. Convert the data item to a z-score,…
A:
Q: The mean body mass index (BMI) for boys age 12 is 23.6 kg/m2. An investigator wants to test if the…
A: Given detect a difference in BMI of 2 kg/m2 standard deviation in BMI is 5.7 kg/m2. Asume that…
Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.4 and a standard…
A: We have to find first quartile. First quartile (Q1) is the values such that 25% data fall below that…
Q: A local company makes a candy that is supposed to weigh 1.00 gram. A random sample of 25 pieces of…
A: Givenstandard deviation(s)=0.004Margin of error(E)=0.001Confidence interval = 99%
Q: Given that the mean for a data set is 24.8 and the standard deviation is 2.3, find the z-score of…
A:
Q: Assume that adults have IQ scores that are normally distributed w 21.6. Find the first quartile Q,,…
A: Given: mean=μ=95.1 standard deviation=σ=21.6
Q: The reading speed of second grade students in a large city is approximately normal, with a mean of…
A: Given data,Mean μ=88sd σ=10If n=10P(X>93)=?
Q: An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the…
A: From the provided information,
Q: The life span of a brand of tireis normally di stributed with a mean of 50,000 miles and a standard…
A:
Q: Use z scores to compare the given values. The tallest living man at one time had a height of 233 cm.…
A:
Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…
A:
Q: 9. Assume that the heights of a population of adults form a normal distribution with a mean p =69…
A: Solution: Question 9 Given information: n= 25 Sample size μ=69 inches Population standard…
Q: The breaking distances from a speed of 60 mph to a complete stop on dry pavement are normally…
A: From the given information,Let the x be a random variable that represent the breaking distance which…
Q: The length of a fully grown hibiscus plant has a mean 35cm. It is found that 5% of these plants are…
A: (i) Obtain the value of the standard deviation. The value of the standard deviation is obtained…
Q: Surveyors measured the number of cars that go through the intersection of Howard Street and Stadium…
A: Given that Mean=Xbar=900.3 Standard deviation=sigma=17.35
Q: Consider a data set that has a mean of 18.4 and a standard deviation of 7. According to Chebyshev's…
A: The mean is 18.4 and the standard deviation is 7.
Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…
A: Given Information: Mean μ=196 Standard deviation σ=22 Let X denote the number of red meat a person…
Q: A data obtained from a random sample has mean 68 and standard deviation 35. The value whose Z-score…
A:
Q: ... Since the z score for the male is z= |and the z score for the female is z= ], the has the weight…
A:
Q: A normal population has a mean of 37 and a standard deviation of 8 A.What proportion of the…
A: Given Population mean μ=37, standard deviations σ=8
Q: If we draw one case at random from a population where the raw scores are normally distributed, which…
A: Solution: From the given information, raw scores are normally distributed.
Q: he time need to complete a math examination is bell-shaped with a mean of 90 ninutes and a standard…
A:
Q: In a survey of a group of men, the heights in the 20-29 age group were normally distributed, with…
A:
Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.6 and a standard…
A: Given,μ=96.6σ=19 First quartile, Q1 score is separating the bottom 25% from the top 75%. Z score…
Q: The mean age for licensed physicians in the United States is 51.5 years. A government official…
A:
Q: he average age of vehicles registered in the United 96 months. Assume the population is normally…
A: Given: μ=96, σ=15, n=36 Calculate the corresponding z scores as:
Q: About 13% of the population has blue eyes. 1700 people are randomly selected. a. Find the mean…
A: It is given that About 13% of the population has blue eyes i.e. probability that a population has…
Step by step
Solved in 2 steps with 2 images
- A population has a mean 75 and standard deviation 12. a. A random sample of 125 are taken. Find the mean and the standard deviation of the sample mean. b. How would the answer to part (a) change if the size of the sample were 500 instead of 125?Assume that adults have IQ scores that are normally distributed with a mean of 98.4 and a standard deviation 20.5. Find the first quartile Upper Q 1 , which is the IQ score separating the bottom 25% from the top 75%. a. The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)Twenty-six percent of all automobiles undergoing an emissions inspection at a certain inspection station fail the inspection. Suppose 20 randomly selected cars are tested. Round all answers three decimal places. 1)Find the mean number of cars which will fail the inspection.2) Find the standard deviation of the number of cars that will fail the inspection.
- Use z scores to compare the given values. The tallest living man at one time had a height of 256cm. The shortest living man at that time had a height of 114.6 cm. Heights of men at that time had a mean of 174.87 cm and a standard deviation of 7.57 cm. Which of these two men had the height that was more extreme? Since the z score for the tallest man is z=____ and the z score for the shortest man is z=_____, the (Shortest/tallest) man had the height that was more extreme. (Round to two decimal places.)The average score of all golfers for a particular course has a mean of 61 and a standard deviation of 5. Suppose 100 golfers played the course today. Find the probability that the average score of the 100 golfers exceeded 62. Round to four decimal places. O A. 0.1293 B. 0.3707 O C. 0.4772 O D. 0.0228Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. Find Pg9, the 69-percentile. This is the temperature reading separating the bottom 69% from the top 31%. P69 = °C
- The average time it takes a certain brand of ibuprofen to start working is 25 minutes, with a standard deviation of 13 minutes, distributed normally. A pharmacist randomly samples 20 pills from this brand, because she is researching different brands in order to find the quickest acting ibuprofen to recommend to her customers. Identify the following to help her make her recommendations, rounding to the nearest hundredth if necessary:This assignment is worth 1 points. The extra point will be added to your overall course grade. For example: if you receive an 88% in the course you can receive up to 1 point giving you a new score of 89%. The following rubric will be used. 0.25 point for drawing the normal distribution curve with the mean value labeled on the curve and the appropriate area shaded. 0.25 point for determining the value of the standard deviation of the sample mean. 0.5 point for finding the correct probability. All work must be shown in order to receive any credit. Please upload your completed assignment here. The length of time taken on the SAT for a group of students is normally distributed with a mean of 2.5 hours and a standard deviation of 0.25 hours. A sample size of n = 60 is drawn randomly from the population. Find the probability that the sample mean is between two hours and three hours.The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.02 level that the medicine relieves pain in more than 346 seconds. For a sample of 58 patients, the mean time in which the medicine relieved pain was 352 seconds. Assume the population standard deviation is 23. Find the P-value of the test statistic. 囲 Tables E Keypad Keyboard Shortcuts 0.0582 %3D IX
- Suppose a set of data has a sample mean of 112 and a sample standard deviation of 8.3. What is the z-score for the value 127.8? Round the z-score to two decimal places. Your Answer:Suppose that the average number of Facebook friends users have is normally distributed with a mean of 136 and a standard deviation of about 45. Assume forty-two individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. Find the third quartile for the average number of Facebook friendsThe mean weight of 1000 students at a certain high school is 140 pounds and the standard deviation of 10 pounds. Assuming that the weights are normally distributed. How many students weigh more than 150 pounds? Select one: O 342.3 O 343.3 O 341.3 O 344.3