i need this to study for my exam next week, im kind of lost any help and explanation with this practice would be appreciated

1.The amount of time devoted to studying statistics each week by students who achieve a grade of A in the course is a normally distributed random variable with a mean of 8.5 hours and a standard deviation of 2.0 hours. [Hint: use the Z-table]

What proportion of A-students study for more than 10 hours per week?

Find the probability that A students spends between 7 and 9 hours studying.

What proportion of A-students spends less than 3 hours studying?

2. Calculate the value of the test statistic, setup the rejection region (z₀), and determine the p-value. Determine if H₀ is rejected or not rejected in favor of H₁. [Hint: use z_T = z_0.05].

H₀: = 100

H₁: ? 100

? = 2,n = 25,