Statistcs help

Question

I'm lost on this one

 

Listed below are the duration (in hours) of a simple random sample all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lower his duration time unusual?

 

75, 92, 237, 190, 163, 264, 192, 376, 253, 236, 385, 336, 224, 241, 0

 

The range of the sample data is ? Hours.

The variance of the sample data is ?

The standard deviation of the sample data is ? hours

Answer 1

range = max - min = 385-0 = 385

sd = sqrVar

Var = sum of (x- x bar)^2 divided by n-1, x bar = mean, n=number of data

tedious calculation

or use a statistics calculator

the 0 is an outlier. it seems suspicious. how can a flight take 0 hours? maybe it's rounded off? to nearest hour? or maybe it's the Challenger that blew up on takeoff