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3 years ago

11

The surface area of the top surface of the water in a circular swimming pool is about 188 square feet. Estimate the radius of th

e pool, to the nearest foot. about 8 feet about 14 feet about 12 feet about 10 feet

2 answers:

Scorpion4ik [409]3 years ago

5 0

Your answer would be 14ft.

Just square root 206, then round to the nearest whole number.

Vera_Pavlovna [14]3 years ago

4 0

It's about 206 square feet

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A number cube with the numbers 1 through 6 is rolled. What is the probability of the number cube showing a 4 or a number less th

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2 years ago

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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]

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

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

q' = 1 - 0.74 = 0.26

We need to find the probability that out of 60 trains, 38 or lesser trains arrive on time.

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The proportion of the given sample, p = $\frac{38}{60} = 0.634$

Therefore, the probability is given by:

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

P $(p\leq 0.634) = P[z\leq -1.87188]$

P $(p\leq 0.634) = P[z\leq -1.87] = 0.0298$

Therefore, Probability of the 38 or lesser trains out of 60 trains to be on time is 0.0298 or 2.98 %

Thus the on-time rate of 74% is incorrect.

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2 years ago