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3 years ago

A rectangular swimming pool has a volume capacity of 2160 cubic feet

Mathematics

1 answer:

Olin [163]3 years ago

6 0

Answer: 100 minutes

Step-by-step explanation:

7.5 gal/ft^3 for water

A 2160 ft^3 pool has room for (2160 ft^3)*(7.5 gal/ft^3) = 16,200 gallons of water

Water needed to fill: (16,200 gal - 1200 gal) = 15,000 gal

Rate of filling: 20 ft^3/min

(20 ft^3/min)*(7.5 gal/ft^3) = 150 gal/min

Tiome to add 15,000 gallons of water:

(15,000 gal/150 gal/min) = 100 minutes

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Read 2 more answers

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leva [86]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The confidence level interval is $0.016 \le C \le 0.404$

Step-by-step explanation:

The sample size is $n = 20$

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The confidence level is $c = 98$ %

The value of proportion for a plus 4 method is

$p = \frac{x+2}{n+4}$

substituting values

$p = \frac{3+2}{20+4}$

$p =0.21$

The z-critical value at confidence level of 98% is

$z_{c}=z_{0.98} = 2.33$

This values is obtained from the standard normal table

The confidence level interval can be mathematically represented as

$C =p \ \pm z_{c} * \sqrt{\frac{p(1-p)}{n+4} }$

substituting values

$C = 0.21 \pm 2.33 * \sqrt{\frac{0.21(1- 0.21)}{20 +4} }$

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3 years ago

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:)))

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