A gallon of latex paint can cover 600 square feet. Maria has a rectangular room whose dimensions are 23 feet by 10 feet, with 7
2 answers:
Answer:
1.54 gallons of paint.
Step-by-step explanation:
Maria has a rectangular room whose dimensions are 23 feet by 10 feet, with 7 feet ceilings.
Area = 2(length + width) × height
= 2( 23 + 10)× 7
= 2 × 33 × 7
= 462 feet²
Total area of the room that she has to paint is 462 square feet. She wants to paint two coat on each wall.
Now the area would be 462 × 2 = 924 square feet
A gallon of latex paint can cover 600 square feet.
to paint 924 feet² she needs =
= 1.54 gallons of paints.
She needs to buy 1.54 gallons of paint.
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Answer:
We need a sample size of least 119
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Sample size needed
At least n, in which n is found when
We don't know the proportion, so we use , which is when we would need the largest sample size.
Rounding up
We need a sample size of least 119