Grace is looking at a report of her monthly cell-phone usage for the last year to determine if she needs to upgrade her plan. Th
e list represents the approximate number of megabytes of data Grace used each month. 700, 735, 680, 890, 755, 740, 670, 785, 805, 1050, 820, 750
What is the standard deviation of the data? Round to the nearest whole number.
Step-by-step explanation: Round to the nearest whole number. In order to find the standard deviation, we first have to calculate the mean (average) of the numbers. To get this we add all the numbers together and then divide by 12 since there are 12 numbers. The mean = 782. Next, we take each number and subtract the mean, taking the result and squaring it.
The best answer to this question is to subtract 4 from both sides. This isolates the square root and sets you up for squaring both sides of the equation.
