The average electricity bill for lynn’s home is $64.50 per month with a standard deviation of $8.20. in june she received a bill of only $30.00 because she was traveling for most of the month. how many standard deviations below the mean is the amount of lynn’s electricity bill for june?

4.21 standard deviation below mean.

Step-by-step explanation:

We have been given that the average electricity bill for Lynn’s home is $64.50 per month with a standard deviation of $8.20. In June she received a bill of only $30.00.

We will use z-score formula to solve our given problem.

, where,

,

,

,

Upon substituting our given values in z-score formula we will get,

Since z-score is negative, therefore, the amount of Lynn’s electricity bill for June is approximately 4.21 standard deviations below mean.

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step-by-step explanation:

9-15%

answer: the answer is 35%