The number of hours per day a college student spends on homework has a mean of 6 hours and a standard deviation of 1.25 hours. yesterday she spent 3 hours on homework. how many standard deviations from the mean is​ that? round your answer to two decimal places.

-2.4

Step-by-step explanation:

To calculate how many standard deviations you are from the mean you use Z-score, which is exactly that.

The formula is:

Replacing the information given in the formula you get:

She is -2.4 standard deviations from the mean or 2.4 to the left

step-by-step explanation:

once you graph it hit 2nd (the blue button) and graph

that takes you to a table of coordinates

on the left is x coordinates and on the right is y coordinates and an empty box

(you may have to scroll up/down in order to get ( x, 0)

what do u need to know

step-by-step explanation: