Let the assumed mean, A = 92.5 and h = 5

We obtain the following table from the given data:

We know that Mean,

∴

We know that Variance σ² =

∴ σ² =

We know that Standard Deviation = σ

∴ σ = √105.583 = 10.275

Ans. Mean = 93, Variance = 105.583 and Standard Deviation = 10.275