1. Area of a circle is pi x R^2
Area = 3.14 x 18^2
Area = 3.14 x 324= 1017.36 sq. In.
The blade covers 122 out of 360 degrees.
1017.36 x 122/360 = 345 square inches.
2.
Like above.
Area =3.14 x 75^2 = 17,662.5 square feet
17662.5 x 80/360 = 3,925 square feet.
Answer:
The sample size must be atleast 3600
Step-by-step explanation:
We are given the following in the question:
The scores of individual students on the American College Testing (ACT) Program is a bell shaped distribution that is a normal distribution.
Population standard deviation = 6.0
We want that the sample standard deviation should not be more than 0.1.
Thus, the standard error should not be more than 0.1.
Standard error =

Putting values, we get,

Thus, the sample size must be atleast 3600
Answer:
± 5.919
Step-by-step explanation:
Margin of Error formula = z × standard deviation/√n
Z score for 99% confidence interval = 2.58
n = 19
Standard deviation = 10
Margin of Error = 2.58 × 10/√19
= ± 5.9189259339
Approximately to 3 decimal place = ± 5.919
The answer is of your question is
w-12