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Mademuasel [1]
3 years ago
8

Тогатство

Mathematics
1 answer:
klio [65]3 years ago
3 0

Step-by-step explanation: Multiply

x

x

by

x

2

x

2

by adding the exponents.

Tap for more steps...

3

x

2

+

5

x

+

1

x

3

−

2

x

+

4

3

x

2

+

5

x

+

1

x

3

-

2

x

+

4

Simplify

1

x

3

1

x

3

.

3

x

2

+

5

x

+

x

3

−

2

x

+

4

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Shalnov [3]

Answer:

0.9007 is the probability that a student scored below 86 on this​ exam.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 77

Standard Deviation, σ = 7

We are given that the distribution of examination grades is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

a) P(student scored below 86)

P(x < 86)

P( x < 86) = P( z < \displaystyle\frac{86 - 77}{7}) = P(z < 1.2857)

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

P(x < 1.2857) = 0.9007 = 90.07\%

0.9007 is the probability that a student scored below 86 on this​ exam.

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Step-by-step explanation:

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Step-by-step explanation:

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