Answer:
mean = 77
Step-by-step explanation:
We have a confidence interval of (59, 95) with a confidence of 99.7 percent
99.7 is 6 standard deviations from the mean, 3 on each side of the mean
mean - 3 sigma = 59
mean + 3 sigma = 95
We can use elimination to eliminate sigma. Add these equations together
mean - 3 sigma = 59
mean + 3 sigma = 95
---------------------------------
2 * mean = 154
Divide each side by 2
2 * mean/2 = 154/2
mean = 77
Answer:
i need help too
Step-by-step explanation:
Answer:
It will take 13.71 years
to double your investment
at 5.25% annual interest. (actual years = 13.55)
Step-by-step explanation:
i think its right if not am sorry
If 45=15h then h must be 3
Answer:
Rachel worked for 
hours
<em></em>
Step-by-step explanation:
<em>See comment for complete question</em>
Given
Let
So:
and
as long as D
Required
Determine the number of hours spent by Rachel
This implies that:
as long as D
Rewrite as:
Substitute:
Express as improper fraction
This gives:
Express as mixed numbers
<em>Hence, Rachel worked for </em><em> hours</em>
