How do I calculate mean , variance , standard deviation of a set of numbers with a calculator.
Set of numbers Mid points Frequency
0<x<2 1 7
2<x< 5 3.5 10
What is the mean and variance of these numbers?
Using a scientific calculator, we first calculate the mid point of each interval by adding the 2 numbers and divide by 2. For example on the first interval, (0+2)/2=1.
We click Menu, and 6 for Statistics. We click 1- 1-Var and enter the mid points of each intervals given. First 1 and 3.5. Then for frequency, we enter 7 and 10. We then click OPT and click 3: 1-Variable Calc.
A list of statistical results appear on the screen. The mean is 2.47 and the variance 1.51, standard deviation is 1.23
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