<span>The
population standard deviation is unknown, sample size is less than 30,
and the population has a normal or near-normal distribution</span>.
She ate 10 cookies
1/3 of 30 is 10
If she starts with $8000, she has only $7000 to go.This is reduced by $850 per month.
$7000 - $850x
<span> x2 - 2x + 2
hope this helps</span>
