Answer:
y=9
hope this helps
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Step-by-step explanation:
Answer:
correct answer is J
Step-by-step explanation:
Answer:
x = 30
Step-by-step explanation:

The 25th percentile corresponds to z ≈ -0.67.
The 90th percentile corresponds to z ≈ 1.28.
So, you can write two equations in μ and σ as here:
.. μ -0.67σ = 10
.. μ +1.28σ = 20
The solution is
.. μ ≈ 13.45
.. σ ≈ 5.11