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:
Step-by-step explanation:
First count the number of sides. There are 6 sides.
Now use the formula
(n - 2) * 180 To determine the total of all 6 angles.
(6 -2) * 180 =
4 * 180 = 720
Is that a 9 in x + 9 [lower left]? I'll assume so. Edited to show it was a 4.
x + 4 + 120 + x + 50 + 140 + 112 + x = 720 Combine
3x + 4 + 120 + 50 + 140 + 112 = 720
3x + 426 = 720 Subtract 431 from both sides
3x = 720 - 426 Combine
3x = 294 Divide by 3
x = 294/3
x = 98
Answer:
The correct answer is 0.91
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➷ Just multiply the price by 3:
1.35 x 3 = 4.05
It would cost $4.05
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➶ Hope This Helps You!
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There’s no a in the the equation