Answer:
A) -292.5
Step-by-step explanation:
-65 x 9 = -585
-585 ÷ 2 = -292.5
<span>The mean of a set of data is 148.87 and its standard deviation is 68.29. Find the z score for a value of 490.19
the z-score is given by:
z=(x-</span>μ<span>)/</span>σ
plugging in the values in the expression we get:
z=(490.19-149.87)/68.29
z=340.32/68.29
z=4.9835
Ali has 13 CD's
Here's how I got my answer:
Step 1: Simplify 
to 50. Which leaves us with 
Step 2: Simplify 
to 5. Which leaves us with 
.
Step 3: Simplify , to get your answer, 13.
