The number of hours per day a college student spends on home

The number of hours per day a college student spends on homework has a mean of 4 hours and a standard deviation of 0.75 hours. Yesterday she spent 2 hours on homework. How many standard deviations from the mean is that?

Solution

chegg\'s policy allow me to answer 1 question per post

I can gladly help you with all your question but you should post it in a new question

6)

to find how many SD from the mean is we just need to do a division

2 / 0.75 = 2.67

so there are 2.67 SD below the mean

is below because 2 is below to 4 that is the mean