Question

Listed below are the durations​ (in hours) of a simple random sample of all flights of a space shuttle program. Find the​ range, variance, and standard deviation for the sample data. Is the lowest duration time​ unusual? Why or why​ not?

80   96   232  194   160   260   194   372   259   239   389   337   222   247   0

The range of the sample data is ___ hours. ​(Type an integer or a​ decimal.)

The variance of the sample data is ____ ​(Round to one decimal place as​ needed.)

The standard deviation of the sample data is _____ hours. ​(Round to one decimal place as​ needed.)

Is the lowest duration time unusual​? Why or why​ not?

A. ​No, because the sample is random.

B. ​Yes, because the lowest value in a data set is usually an outlier.

C. No, because it is within two standard deviations of the mean.

D. ​Yes, because it is more than two standard deviations below the mean.

Answer 1

Answer 2