Please, someone, help with this question. This is my last question.
1 answer:
Answer:
4.5 inches high
Step-by-step explanation:
First, find the height of the tub using the volume 350 and the length 76 and width 60 in the volume formula.
Convert 350 gallons to cubic inches by multiplying 350*231 (since 1 gallon has 231 cubic inches). 350*231 = 80,850.
The volume formula for a rectangular prism is .
Substitute l = 76, w = 60 and V= 80850.
80850 = 76*60*h
80850 = 4,560*h
17.7 = h
18 = h
The tub is about 18 inches high. If the water is 1/4 of the way full. it will be 1/4 of the height.
18* 1/4 = 4.5
The water is about 4.5 inches high.
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Answer:
405
Step-by-step explanation:
To find sample size, use the following equation, where n = sample size, za/2 = the critical value, p = probability of success, q = probability of failure, and E = margin of error.
The values that are given are p = 0.84 and E = 0.03.
You can solve for the critical value which is equal to the z-score of (1 - confidence level)/2. Use the calculator function of invNorm to find the z-score. The value will given with a negative sign, but you can ignore that.
(1 - 0.9) = 0.1/2 = 0.05
invNorm(0.05, 0, 1) = 1.645
You can also solve for q which is 1 - p. For this problem q = 1 - 0.84 = 0.16
Plug the values into the equation and solve for n.
Round up to the next number, giving you 405.