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3 years ago

14

Mr Cameron places the names of his students in a hat order to randomly call on students. There are 12 girls and 10 boys in the c

lass what is the probability that a boy will be called on?
A. 1/22
B. 5/11
C. 1/10
D. 5/6

2 answers:

NikAS [45]3 years ago

8 0

The answer is D

10/12 = 5/6

Yuliya22 [10]3 years ago

3 0

Answer:

b 5/11

Step-by-step explanation:

10/22

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Answer:

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Step-by-step explanation:

<em>Let P(W) represents the probability that Paul wins</em>

<em>Let P(W') represents the probability that Paul does not win</em>

Given

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Required

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In probability, the sum of opposite probability equals 1;

This implies that

$P(W) + P(W') = 1$

Substitute $P(W) = \frac{n}{n+6}$ in the above equation

$P(W) + P(W') = 1$ becomes

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$\frac{n}{n+6} - \frac{n}{n+6} + P(W') = 1 - \frac{n}{n+6}$

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Solve fraction (start by taking the LCM)

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Answer:

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Step-by-step explanation:

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4 years ago

Scores for a civil service exam are normally distributed with a mean of 75 and a standard deviation of 6.5. To be eligible for c

kvasek [131]

Answer:

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Step-by-step explanation:

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In this question, we have that:

$\mu = 75, \sigma = 6.5$

Top 5%.

At least the 100-5 = 95th percentile.

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