A sample of 33 households from a survey generates the following frequency table of household income (in thousands). Find the Interval Frequency 0-29 11 30-59 mean and standard deviation. 60-89 90-119 120-149 150-179 180-209 ...... X = thousand dollars. (Round to one decimal place as needed.) 49203 3
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- The frequency distribution given below is constructed from the ages of 200 people of 40 years old or older. Age Interval Rel. frequency 40-49 0.25 50-59 0.28 60-69 0.30 70-79 0.08 80-89 0.06 90-99 0.03 Based on this frequency distribution number of people who are older than 59 and younger than 80 isThe accompanying frequency distribution represents the square footage of a random sample of 500 houses that are owner occupied year round. Approximate the mean and standard deviation square footage. EE Click the icon to view the data table. The mean square footage is x (Round to the nearest integer as needed.) The standard deviation square footage is s X Housing Data (Round to one decimal place as needed.) Square footage 0-499 Frequency 500 13 1,000 1,499 1,500 1,000 36 121 2,000 2.499 2,500 2,999 3,000 3,409 119 83 45 3,500-3,999 4,000 4,499 4,500 4,009 41 26 Print Donemiles Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 63 -. The highway patrol's policy is to issue hour miles tickets for cars with speeds exceeding 75 . The records show that exactly 2% of the speeds exceed this limit. Find the standard deviation of the speeds of hour cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. miles hour
- 6The estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in the pie chart. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Use 70 as the midpoint for "65 years and over." ... The sample standard deviation is s = as needed.) Under 4 years: 23.3 5-14 years: 42.4 15-19 years: 19.2 20-24 years: 23.5 25-34 years: 43.5 35-44 years: 40.3 45-64 years: 81.8 65 years and over: 52.9 (Round to two decimal placesThe distribution of the number of hours that a random sample of people spend doing chores per week is shown in the pie chart. Use 32 as the midpoint for "30+ hours." Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. W Click the icon to view the pie chart. ..... 5-9 12 10-14 23 15-19 16 20-24 18 25-29 12 30+ 4 Find an approximation for the sample mean. x= 16.6 (Type an integer or decimal rounded to the nearest tenth as needed.) Find an approximation for the sample standard deviation. s= (Type an integer or decimal rounded to the nearest tenth as needed.)
- Show your handwritten work on the paper. The following is a frequency distribution of ages of residents of a senior citizens' home in New York. Fill in the midpoints, then calculate the mean and the standard deviation. Round to two decimal positions. You may assume the data represents a population. Ages of Residents Midpoints Frequency 50-62 63 75 76--88 a. Mean (u)3D b. Standard deviation (o) = Round the standard deviation up to 2 decimal places if necessary. Hint: Use the midpoint for each class (ages of residents). 2.Ch 8 FRQ ( The distribution of average speeds of the top 53 drivers in NASCAR is roughly symmetric, unimodal, and bell-shaped, with a mean of 184.8 mph and a standard deviation of 7.2 mph. In the space above, draw a Normal Curve, from z=-3 to z=+3. Draw vertical lines at the mean and each whole number standard deviation above and below the mean. Write two rows of numbers under the base line; one row with the number of standard deviations above and below the mean (z-scores), and a row under that with the actual values for this problem. ] What percent of drivers would you expect to have speeds below 199.2 mph ? Show all work. s] What is the area under the curve to the left of a speed of 170.4mph Show all work. What is the probability that a driver selected at random will have a speed below 172.0 mph ? Show all work. B] What percent of drivers would you expect to have a speed above 177.0 mph ? Show all work. How many drivers would you expect to have speeds between 170.4 mph and 177.0 mph…Use the following frequency distribution table to find the value of the mean score. Scores Frequency1 - 3 54 - 6 17 - 9 3 Find the value of the standard deviation. Give your answer accurate to 1 place after the decimal point. σ =
- The numbers of courses taught per semester by a random sample of university professors are shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. 25- 24 20- 17 16 15 10- 5- Number of courses taught per semester f 1 2 16 24 4 17 The sample mean is x = 2.9 (Round to one decimal place as needed.) The sample standard deviation is s = (Round to one decimal place as needed.) Number of professorsstatsFind the mean of the grouped frequency distribution. Interval Frequency 0-9 4 10-19 20-29 30-39 40-49 50-59 5 10 9 3 1 ESS D What is the mean of the grouped data? (Round to the nearest hundredth as needed.)