Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 90

1 Use the frequency distribution table you prepared in Problem 4 of Section 2.3 to do the following:Determine the mean, median, and mode of the grouped data.Determine the variance and the standard deviation of the grouped data.

2 Use the frequency distribution table you prepared in Problem 5 of Section 2.3, to do the following:Determine the mean, median, and mode of the grouped data.Determine the variance and the standard deviation of the grouped data.

3 Use the frequency distribution table you prepared in Problem 6 of Section 2.3 to do the following:Determine the mean, median, and mode of the grouped data.Determine the variance and the standard deviation of the grouped data.

4 The following data give the systolic blood pressures of 30 US male adults whose ages are 30–40 years old:113122111119125113123122115115112117121116118116109109112116122109110115109115120122125111Determine the mean, median, and mode of these data.Determine the variance and the standard deviation of these data.Prepare a frequency distribution table for these data.Use the frequency distribution table of part (c) to determine the mean, median, and mode of the grouped data. Compare your results with those in part (a) and comment.Use the frequency distribution table of part (c) to determine the variance and the standard deviation of the grouped data. Compare your results with those in part (b) and comment.

5 The data below gives the time (in minutes) taken by 36 technicians to complete a small project:555846584946416059415943424044425846585840515949484642435648415456574843Construct a frequency distribution table for these data. Find the mean and the standard deviation of the grouped data, and then compare them with the actual mean and standard deviation (that is, the ungrouped and S) of these data.