Answer:
The 98% confidence interval for the mean number of hours of study time per week for all students is (20.9, 25.1).
Step-by-step explanation:
Confidence interval:
Sample mean plus/minus the margin of error.
In this question:
Mean of 23.
Margin of error 2.1.
Then
23 - 2.1 = 20.9
23 + 2.1 = 25.1
The 98% confidence interval for the mean number of hours of study time per week for all students is (20.9, 25.1).
Coastline receded in a year = 3 centimeters
Number of years when coastline gets receded = 8 years
Length of coastline receded in 8 years = 3 * 8 = 24 cms
It would cost 6.50 dollars because ur adding $1.00 , $0.50 , and $5
Answer:
First = 100
Second = 1
Step-by-step explanation:
There are 8 - 100's in 800
There is 1 - 8 in 8
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Answer:
The area is 8000 square feet.
Step-by-step explanation:
Since one inch in the drawing is equal to 20 feet, multiply 4 by 20 to get the length in feet. So the length equals 80 feet. Then multiply 5 by 20 to get the width. So the width equals 100. Finally plug the width and the length into the formula for Area. A= length X width; A= 80 X 100; A= 8000