The National Football League (NFL) polls fans to develop a rating for each footba game. Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample of 12 games follow. 56 60 86 75 72 72 21 57 81 79 83 73 a. Develop a point estimate of mean fan rating for the population of NFL games (to 2 decimals). b. Develop a point estimate of the standard deviation for the population of NFL games (to 4 decimals).

Use the grouped data formulas to find the indicated mean or standard deviation. For the following data set, approximate the sample standard deviation. Height (in inches) Frequency 50-52 53-55 56-58 12 59-61 13 62-64 11 E

Using your calculator, find the range and standard deviation, round to two decimals places:The table below gives the number of hours spent watching TV last week by a sample of 24 children. 71 23 53 59 75 72 34 26 52 78 38 50 65 83 54 87 60 84 23 83 90 28 94 10 Range = Standard Deviation =

The 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." I Under 4 years: 18.5 I 5-14 years: 39.7 O 15-19 years: 17.4 O 20-24 years: 18.7 I 25-34 years: 40.8 I 35-44 years: 36.2 I 45-64 years: 84.7 I 65 years and over: 54.7 The sample mean is x=. (Round to two decimal places as needed.) The sample standard deviation is s = (Round to two decimal places as needed.)