Consider the data set. 2, 4, 6, 7, 9 (a) Find the range. (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.) (c) Use the defining formula to compute the population standard deviation ?. (Round your answer to two decimal places.)

Using the stemplot of annual precipitation (inches) below, determine the range, IQR, variance and standard deviation. Please answer correctly.

The ages​ (in years) of a random sample of shoppers at a gaming store are shown. Determine the​ range, mean,​ variance, and standard deviation of the sample data set. 12, 20, 23, 13, 18, 17, 22, 17, 15, 16 The range is The mean is ( Simplify your answer. Round to the nearest tenth as​ needed.) The variance is (Simplify your answer. Round to the nearest hundredth as​ needed.) The standard deviation is (Simplify your answer. Round to the nearest tenth as​ needed.) Can you please explain me this math problem having trouble understanding. Thank you.

The 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. Click the icon to view the pie chart. First construct the frequency distribution. Class Frequency, f 0-4 5-9 10-14 15-19 20-24 25-29 30+ Find an approximation for the sample mean. X= (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.) Weekly Chore Hours 0-4 hours (3 people) 5-9 hours (14 people) 10-14 hours (21 people) 15-19 hours (18 people) 20-24 hours (17 people) 25-29 hours (11 people) 30+ hours (7 people) - X -