The test Score of a Math class with 800 students are distributed normally with a mean of 75 and a standard deviation of 7. a) What percentage of a class has a test score between 68 and 82? b) Approximately how many students have a test score between 61 and 89? c) What is the probability that a student chosen at random has a test score between 54 and 75? d) Approximately how many students have a test score greater than or equal to 96?

Q: Suppose the scores on an IQ test are normally distributed. If the test has a mean of 100 and a…

A:

Q: Mario's weekly poker winnings have a mean of 323 dollars and a standard deviation of 50 dollars.…

A: Suppose the random variable x defines the weekly poker winning amount.

Q: SAT exam scores are normally distributed with mean 500 and standard deviation 100.  Give the…

A: Let X= SAT exam score  Given that X follows normal distribution with mean=500 and standard deviation…

Q: 500 freshmen at Arundel University took part in a math comprehension test. The scores were normally…

A: Given: μ=75 and σ=7. The z-score is calculated asz=x-μσ

Q: The average test score in a certain statistics class was 88 with a standard deviation of 11. There…

A: Note: According to bartleby experts question answers guidelines an expert can solve only first three…

Q: SAT exam scores are normally distributed with mean 500 and standard deviation 100.  Give the…

A: Let X= SAT exam score  Given that X follows normal distribution with mean=500 and standard deviation…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Normal Distribution: The normal distribution has a bell-shaped curve which is symmetric in nature. μ…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated.

A: Population standard deviation, σ =3 inches Sample size n=6

Q: A population has a mean of 180 and a standard deviation of 24. A sample of 64 observations will be…

A: Given data, mean=180 sd=24 If n=64 P(183<X<186)=?

Q: New York City is the most expensive city in the United States for lodging. The mean hotel room rate…

A: Given that μ = 204 , σ =55

Q: The mean score in the college entrance examination of 50 with a standard deviation of 12. If a…

A:

Q: Blood glucose levels are normally distributed with a mean of 85 mg/dl and a standard deviation of 25…

A: Answer: Given that:   ‘x’ is Normally distributed with                 Mean  µ =85       standard…

Q: Data was collected on the number of television sets in a household, and it was found that the mean…

A: It is an important part of statistics. It is widely used.

Q: The average speed of cars passing a checkpoint is 60 miles per hour with a standard deviation of 8…

A: From the provided information,n = 50

Q: A student got the following scores on 10 quizzes over the course of a semester: 55, 65, 70, 70, 72,…

A: Given : A student got the following scores on 10 quizzes over the course of a semester  55, 65, 70,…

Q: In a class of 29 students, 28 of them took an exam in class and 1 student took a make-up exam the…

A: a)   The average score for 28 exams is 81 points and standard deviation is 7.4.

Q: a. What percentage of students scored less than 68? b. What is the probability that a student scored…

A: Let , X→N(μ=88 , σ=11) , n=2500 Our aim is to find the following : a) P(X<68) b) P(66<X<82)…

Q: a) What is the mean speed now? What is the new standard deviation? The new mean would be mph. The…

A:

Q: 3. Thermometers in a freezer are normally distributed with a mean of 0 degrees and a standard…

A: Given that the thermometers in a freezer are normally distributed with a mean of degrees and a…

Q: Suppose that 100,000 recent grads have starting salaries which are normally distributed with a mean…

A: (d) Obtain the number of recent grads earns above $95,000. The number of recent grads earns above…

Q: One in ten adults in a city visited a doctor last month. If a sample of 6 adults is selected…

A: Given,  One in 10 adults visited a doctor => p = 1/10 = 0.1 Sample size, n = 6 Let X is the…

Q: Consider a population of 800 values that are normally distributed with a mean of 80 and standard…

A: Given information Mean = 80 Standard deviation= 5 Z score = x - mu /s

Q: 35) The mean score of a college entrance test is 500, the standard deviation is 75. The score…

A: Mean(μ)=500 standard deviation(σ)=75

Q: Given the following scores of students in a test: 5,7,11,12,13,18 a) add 8 to each score then find…

A: Given that  The data are 5,7,11,12,13,18

Q: ppose the average age of family members is 34 with a standard deviation of 4. If 100 members of the…

A: Given, μ=34σ=4 n=100

Q: All California 5th graders take a standardized test. The mean for the population of 5th graders is…

A: If a random variable X has a distribution with mean µ and standard deviation σ, then the Z-score is…

Q: a) How many standard deviations from the mean would a car going the speed limit be? b) Which would…

A: