The mean ( average ) is given as 1200 hours.
The standard deviation is 200, sample size is 100.
Find the standard error:
√(200^2 / 100) = 20
Now calculate the confidence interval. For 95% the Z number is 1.96
Multiply Z by the standard error:
1.96 x 20 =39.2
Now find the range that the mean should be within:
1200 - 39.2 = 1160.8
1200 + 39.2 = 1239.2
The samples should be between 1160.8 and 1239.2 for a 95% confidence interval.
Since the average was 1050, which is below 1160.8 the bulbs are not in compliance.
Answer:
20
Step-by-step explanation:
5 plus 7 plus 10 plus 3 = 25
25x4=100
5x4=20
20%
Another way
5/25 = 0.2
0.2 =20%
Answer:
16pi
Step-by-step explanation:
144pi is the area of the whole circle
(360 - 320)/360 = 1/9
144*1/9=16
You would just add both of the numerators together.
example: 3\6 + 2\6 + 5\6
hope this helps you!
Answer:
100
Step-by-step explanation:
I thinks it 100 cuz 15x20= 300 and ⅓ of 300 is 100
