Question

A test has a mean of 80 and a standard deviation of 4. What score is within o e standard devaluation of the mean

Answer 1

Kindly check explanation

Explanation:

Given that:

Mean score (m) = 80

Standard deviation = 4

Acore within one standard deviation of the mean:

Zscore = ± 1

Using the relation:

Zscore = (x - mean) / standard deviation

Where x = score

±1 = (x - 80) / 4

4 = x - 80

±4 + 80 = x

x = - 4 + 80 = 76

x = 4 + 80 = 84

Scire with 1 standard deviation of the mean :

76 = 1 standard deviation below

84 = 1 standard deviation above