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dedylja [7]
3 years ago
8

Consider a normal distribution curve where 90-th percentile is at 20 and the 25-th percentile is at 10. use this information to

find the mean, μ , and the standard deviation, σ , of the distribution.

Mathematics
1 answer:
ivann1987 [24]3 years ago
5 0
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

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