4 1/4 divided by 3 and 1/2
1 answer:
Answer:
1 3/14
Step-by-step explanation:
1. You want to turn the fractions into mixed numbers.
2. 4 1/4 is equal to 17/4
3. 3 1/2 is equal to 7/2
4. I have a fraction calculator and got 1 and 6/28.
5. To solve it yourself, flip 7/2 to make it 2/7 and change from division to multiplication.
Looked like: ÷
Looks like: ·
17 times 2 is 34 and 4 times 7 is 28. Leaving us with 34/28.
Now just simplify and get an answer of 1 and 3/14.
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Answer:
189 components must be sampled.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
That is z with a pvalue of , so Z = 2.575.
Now, find the margin of error M as such
Assume that component lifetimes are normally distributed with population standard deviation of 16 hours.
This means that
How many components must be sampled so that a 99% confidence interval will have margin of error of 3 hours?
n components must be sampled.
n is found when M = 3. So
Rounding up:
189 components must be sampled.