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Lapatulllka [165]
3 years ago
5

There are 20 children in the cast of a class play, and 8 of the children are boys. Of the boys, 4 have a speaking part in the pl

ay, and of the girls, 8
do not have a speaking part in the play. If a child from the cast of the play is chosen at random, what is the probability that the child has a
speaking part?
A: 2/5
B: 1/2
C: 3/5
D: 3/4
Mathematics
1 answer:
Yuri [45]3 years ago
3 0
A 2/5 of the students because because 8 out of the 20 students have speaking parts
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Answer:

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Step-by-step explanation:

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Get a common denominator

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Tobi scored 145 on an iq test with a mean of 100 and a standard deviation of 15. what is her z score?
Andreas93 [3]

Z-score if Tobi scored 145 on an iq test with a mean of 100 and a standard deviation of 15 is 3.

According to the given question.

Tobi scored 145 marks on an iq test.

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Standard deviation, σ = 15

As we know that,

A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of values.

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Therefore,

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Hence,Z-score if Tobi scored 145 on an iq test with a mean of 100 and a standard deviation of 15 is 3.

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Step-by-step explanation:

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