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3 years ago

8

Olivia has an average score 90 on her five French tests if she earns a score of 98 on the sixth test what will he average score

be

1 answer:

SVETLANKA909090 [29]3 years ago

7 0

Answer:

91.33

Step-by-step explanation:

90x5=450, add 98 to get 548. Since there are 6 tests, divide 548 by 6 and you get 91.33

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Answer:

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Step-by-step explanation:

We are given the following information in the question:

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Standard Deviation, σ = 2.2

We assume that the distribution of response is a bell shaped distribution that is a normal distribution.

Formula:

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a) We have to find the value of x such that the probability is 0.92

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$P( X < x) = P( z < \displaystyle\frac{x - 5.9}{2.2})=0.62$

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

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$P( X < x) = P( z < \displaystyle\frac{x - 5.9}{2.2})=0.25$

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

$P(z$

$\displaystyle\frac{x - 5.9}{2.2} = -0.674\\x = 4.4172 \approx 4.4$

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