How to find one and two standard deviations above and below the mean when the mean is 27.8?

Question

Mean is 27.8 and the standard deviation is 4.79

Answer 1

Mean = μ = 27.8

Standard deviation = σ = 4.79

 

One standard deviation above and below mean:

• μ + σ
• μ - σ

 

Two standard deviations above and below mean:

• μ + 2σ
• μ - 2σ

 

Plug in the values for μ and σ and compute away!