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Anni [7]
3 years ago
5

Can someone please please please help me please

Mathematics
1 answer:
anzhelika [568]3 years ago
5 0

#9 is answer A) yes,

#10 the answer is A) (n,j)

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Find the area of the circle. round your answer to the nearest hundredth<br> radius= 2cm
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12.57cm

Step-by-step explanation:

Formula : Pi×r²

pi×2²=4pi=12.56637061

rounded : 12.57cm

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Mrs.Smith has 3 boys to every 5 girls in her class. What percent of her class is boys?
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SAT verbal scores are normally distributed with a mean of 433 and a standard deviation of 90. Use the Empirical Rule to determin
laila [671]

34% of the scores lie between 433 and 523.

Solution:

Given data:

Mean (μ) = 433

Standard deviation (σ) = 90

<u>Empirical rule to determine the percent:</u>

(1) About 68% of all the values lie within 1 standard deviation of the mean.

(2) About 95% of all the values lie within 2 standard deviations of the mean.

(3) About 99.7% of all the values lie within 3 standard deviations of the mean.

$Z(X)=\frac{x-\mu}{\sigma}

$Z(433)=\frac{433-\ 433}{90}=0

$Z(523)=\frac{523-\ 433}{90}=1

Z lies between o and 1.

P(433 < x < 523) = P(0 < Z < 1)

μ = 433 and μ + σ = 433 + 90 = 523

Using empirical rule, about 68% of all the values lie within 1 standard deviation of the mean.

i. e. ((\mu-\sigma) \ \text{to} \ (\mu+\sigma))=68\%

Here μ to μ + σ = \frac{68\%}{2} =34\%

Hence 34% of the scores lie between 433 and 523.

8 0
3 years ago
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