Question

  

Compute the range and sample standard deviation for strength of the concrete​ (in psi).

3930​,

4120​,

3200​,

3200​,

2980​,

3870​,

4120​,

4060

The range is _ psi

s=_psi

Answer 1

The data is

3930​,4120​,3200​,3200​,2980​,3870​,4120​,4060

So we have total 8 observations

n = 8

Maximum = 4120

Minimum = 2980

Range = Maximum - Minimum = 4120 - 2980 = 1140 psi

For standard deviation first we will find mean

Standard deviation is

So

Range = 1140 psi

Standard deviation = 475.2142374 psi

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