The standard deviation from the National Health and Nutrition Survey is 1.29 hours. What is the variance (rounded to the hundredth place) ?

variance = 1.66 hours

Step-by-step explanation:

It is given that,

The standard deviation from the National Health and Nutrition Survey is 1.29 hours.

We need to find the variance. We know that the relationship between the variance and the standard deviation is given by :

or

Variance = 1.66

So, the variance is 1.66 hours.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

the answer is 21%.