15%=3
5%=1
5(20)=100
1(20)=20
So, there are 20 students in the class.
D 80
32/40 *100
Precent proportions
32/x = 40/100
Cross multiply
Answer:
-5.2, -4.75, -9/2
Step-by-step explanation:
I think the answer would be C but I am not certain.
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
