Mathematics: HELP!! Please answer the riddle and you ll get an extra gift:): Mr. and Mrs. Mustard have six daughters and each daughter has one brother named Marcus, Deangelo, and Mustard. How many people are in the Mustard family?

HELP!! Please answer the riddle and you ll get

dani3112

30.11.2020

Step-by-step explanation:

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lovely222

30.11.2020

Edit : 9

Thanks for helping!

Step-by-step explanation:

This is difficult

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haileyrae187

15.04.2022

X₀ = 71.65

Step-by-step explanation:

given,

mean (μ ) = 64

standard deviation (σ) = 9

σ² = 81

selected candidate are top 20 % candidate

P( X > X₀) = 0.2

$P( Z \dfrac{X_0-\mu}{\sigma}) = 0.2$

$P( Z \dfrac{X_0-64}{9})= 0.2$

P( Z > Z₀) = 0.2

$Z_0 = 0.85 = \dfrac{X_0-64}{9}$

X₀ = 71.65

Hence, the cut off score is equal to X₀ = 71.65

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