<span>204
First, lookup a standard normal table and see what the z-score is for 0.025 (one half of 100% - 95%) to allow for equal sized tails. You should find that the z-score is 1.96. That means that 95% of the time, the value should be within 1.96 standard deviations of the mean. Now let's calculate the standard deviation.
800 is 800 - 1200 = -400 to the left of the mean of 1200.
1600 is 1600 - 1200 = 400 to the right of the mean of 1200.
So we are an equal distance of 400 on both sides of the mean. And we know from the z-score of 1.96, that we're 1.96 standard deviations from the mean. So a little division will give us the standard deviation. Which is:
400 / 1.96 = 204.0816327
So the standard deviation of the light bulbs is 204</span>
Answer:
65
Step-by-step explanation:
https://www.gktoday.in/aptitude/the-next-number-of-the-sequence-3-5-9-17-33-is/
<span>Let the number be x.
The quotient of negative 1 and the product of a number and 21 is -1/21x</span>
3:4 = 3/4
3/4 = 3 divided by 4
3 divided by 4 = 0.75
0.75 = 75%
C. 75%
Answer:
16.4 TRUST ME
Step-by-step explanation:
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