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miskamm [114]
3 years ago
11

Please solve!!!!!!!!!

Mathematics
1 answer:
Likurg_2 [28]3 years ago
6 0

Answer:

A

Step-by-step explanation:

Plugging (t-2) in for x, you are left with:

f(t-2)=\sqrt{4(t-2)+1}=\\\sqrt{4t-8+1}=\\\sqrt{4t-7}or answer choice A. Hope this helps!

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Merta reports that 74% of its trains are on time. A check of 60 randomly selected trains shows that 38 of them arrived on time.
kenny6666 [7]

Answer:

No, the on-time rate of 74% is not correct.

Solution:

As per the question:

Sample size, n = 60

The proportion of the population, P' = 74% = 0.74

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P(p\leq 0.634) = [\frac{p - P'}{\sqrt{\frac{P'q'}{n}}}]\leq [\frac{0.634 - 0.74}{\sqrt{\frac{0.74\times 0.26}{60}}}]

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