a. Transform
, the random variable representing SAT scores, to
, the same random variable but following the standard normal distribution, via


so that about 93.77% of scores fall below 675.
b. Use the same strategy to compute
:

Then out of 1000 scores, you would expect about 574 of them to exceed 525.
To the nearest percentage point, what percentage of students who play a sport don’t play a musical instrument?
First, using the information given, fill out the chart with the rest of the data (in the image attached)
Then find the number of students who play a sport and don’t play a musical instrument, which in the chart is 11
Place 11 over the total:
and convert to a percentage:
44%
X=7 and y=4 are the correct equations