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spayn [35]
3 years ago
5

A boy sits for 15 maths exams during the year and gains an average of 1.". He sits for one

Mathematics
1 answer:
Jobisdone [24]3 years ago
6 0

New average

=  \frac{1 + 65}{2}

=  \frac{66}{2}

= 33

Therefore, the boy's new average is 33%

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A survey shows that 10% of the population is victimized by property crime each year. A random sample of 527 older citizens (65 y
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Answer:

The data provide sufficient evidence that older people are more likely to be victimized.

Step-by-step explanation:

H 0 : P = 0.10

H 1 : P > 0.10 (Right tailed test)

n = 527, P = 0.1235

The test statistics

x = P - p / \sqrt{p*(1-p) / n}

x = 0.1235 - 0.10 / \sqrt{0.10 * 0.90 / 527}

x = 0.0235 / \sqrt{0.09 / 527}

x = 0.0235 / \sqrt{0.00017077798}

x = 0.0235 / 0.0130682049264618

x = 1.798257689731729

x = 1.798

P value = [1 - p(Z > 1.7980] (Right tailed test)

P value = 0.036089

The P - Value is very small, so <u>reject H0</u>

Conclusion: The data provide sufficient evidence that older people are more likely to be victimized.

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