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3 years ago

Please help me on number 3

Mathematics

1 answer:

stira [4]3 years ago

5 0

Percentage of bags on which coupons were placed
Monday - 24/120 × 100 = 20%
Tuesday - 32/130×100 =24.61≈ 25%
Wednesday - 38/155×100 = 24.51≈25%
Thursday - 35/160×100 =21.87≈22%
Friday - 40/135×100 = 29.62 ≈ 30%

As we can clearly see that there are 3 days on which employes placed the coupon for ≥25%.They are Tuesday, Wednesday, and Friday.

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Answer:

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Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 78.8

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We have to find the value of x such that the probability is 0.77

$P( X > x) = P( z > \displaystyle\frac{x - 78.8}{7.1})=0.77$

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Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 78.8}{7.1} =-0.739\\\\x = 73.55$

We have to find the value of x such that the probability is 0.09

$P(X < 0.09) = \\\\P( X < x) = P( z < \displaystyle\frac{x - 78.8}{7.1})=0.09$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 78.8}{7.1} = -1.341\\\\x = 69.27$

Thus, the numerical value of score to achieve grade D is

$69 \leq x \leq 74$

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Answer:

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