## Related questions with answers

Question

Janine is analyzing spending habits of students in her high school. She finds a mean monthly discretionary expense of $70 spent on having meals out with friends. The standard deviation of a distribution is 5. What is the variance?

Solution

VerifiedAnswered 2 years ago

Answered 2 years ago

Step 1

1 of 2Identify the variables:

Standard deviation = 5

Variance = ?

Variance is equal to the square of standard deviation (see page 29):

$\sigma$ = 5 --- Square both sides

$\sigma^{2}$ = $5^{2}$ --- Simplify

$\sigma^{2}$ = 25

Answer: 25

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