8.60 is your answer, you could use a calculator to solve this.
Answer: the z score is - 5.33
Step-by-step explanation:
Since the results for the standardized test are normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = test reults
µ = mean score
σ = standard deviation
From the information given,
µ = 1700 points
σ = 75 points
We want to the Z-score test result of 1300 points.
For x = 1300,
z = (1300 - 1700)/75 = - 400/75 =
- 5.33
9 = (-6p - (-3) / -8
9 = (-6p + 3) / -8 ...multiply by -8 on both sides
9 * -8 = -6p + 3
-72 = -6p + 3
-72 - 3 = -6p
-75 = -6p
-75/-6 = p
25/2 (or 12.5)= p
