Need help with Stats

Question

I am completely disillusioned with this problem could someone give me some help PLEASE!!!!

 

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

For variance i would use some form of technology like a scientific calculator or Microsoft Excel. When I plug all of those values into a calculator I find

Variance =11407.11

Once you have the variance then you can take the square root of that to get standard deviation

Standard Deviation = sqrt(11407.11) = 106.80

Finally then for Range you can find the difference between the highest and lowest flight durations

Range = 385 - 0 = 385