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2 years ago

9

A third grade teacher has 20 students in her class. Fifteen of the students are girls and five are boys. What is the ratio of gi

rls to boys in the third grade class?

1 answer:

svetoff [14.1K]2 years ago

8 0

Answer:

15 : 5 = 3 : 1

Step-by-step explanation:

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3. Mr. James told Jill he would charge her $15 per hour, plus parts, to fix her bicycle.

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512

Solution:

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2 years ago

Find the value of c that makes each trinomial a perfect square.<br> x^2-13x+c

vova2212 [387]

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Step-by-step explanation:

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2 years ago

An Article a Florida newspaper reported on the topics that teenagers most want to discuss with their parents. The findings, the

Sergio039 [100]

Answer:

The estimate is $P__{hat}} \pm E = 0.37 \pm 0.0348$

Step-by-step explanation:

From the question we are told that

The sample size is n = 522

The sample proportion of students would like to talk about school is $\r p__{hat}} = 0.37$

Given that the confidence level is 90 % then the level of significance can be mathematically evaluated as

$\alpha = 100 - 90$

$\alpha = 10\%$

$\alpha = 0.10$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table, the value is

$Z_{\frac{\alpha }{2} } =Z_{\frac{0.10}{2} } = 1.645$

Generally the margin of error can be mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \sqrt{\frac{\r P_{hat}(1- \r P_{hat} )}{n } }$

=> $E = 1.645 * \sqrt{\frac{0.37 (1- 0.37 )}{522 } }$

=> $E = 0.0348$

Generally the estimate the proportion of all teenagers who want more family discussions about school at 90% confidence level is

$P__{hat}} \pm E$

substituting values

$0.37 \pm 0.0348$

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2 years ago