Answer:
Range = The difference between the highest and lowest which is
The mean is the sum of all values divided by the number of values
= 59+19+30+75+42+49+57+81+11+87+91 divided by n (which is 11)
601÷11
= 54.6
Variance = sum of squared deviations from the mean divided by n-1
=679.65
Standard Deviation = This is the square root of variance which gives us;
26.07
