SOLUTION: Can someone walk me through this 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

Question 749952: Can someone walk me through this

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?
77 100 240 191 163 263 195 371 254 231 384 336 223 250 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)

I
Answer by CubeyThePenguin(3113) (Show Source): You can put this solution on YOUR website!
range = highest value - lowest value = 384 - 0 = 384

variance
= (sum of squares of data values subtracted from the mean)/(number of data values - 1)
= 11108

standard deviation
= sqrt(variance)
= 105.4

for reference: mean = (sum of all data values)/(number of data values) = 218.5

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