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Flauer [41]
2 years ago
6

Can somebody please help me? 2+2

Mathematics
2 answers:
Basile [38]2 years ago
8 0

Answer:

4 is the answer =)

Luden [163]2 years ago
3 0
You might want to use a calculator for this one...
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My Notes A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1600 hours and
Evgen [1.6K]

Answer:

The bulbs should be replaced each 1436.9 hours.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 1600, \sigma = 70

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile of hours. So it is X when Z has a pvalue of 0.01.

So it is X when Z = -2.33.

Z = \frac{X - \mu}{\sigma}

-2.33 = \frac{X - 1600}{70}

X - 1600 = -2.33*70

X = 1436.9

The bulbs should be replaced each 1436.9 hours.

6 0
3 years ago
This question is confusing to me so I really would like a clear explanation thank you
Wewaii [24]
So the first hour it travels from 1-6 miles, the second hour it travels at least two miles. And the question is "draw the range of miles the boat could of traveled in the second hour". Well first of all the third hour is completely useless so forget about that. Now, the first hour says it traveled from 1-6 miles, we don't know how many miles it traveled for sure but it could of traveled up to 6. So in the second hour when they say "at least two miles" the boat could of travled at least two miles more than 1-6. So 1+2+3, 2+2+4, 3+2=5, 4+2=6, 5+2=7 and 6+2=8. So the boat could of traveled from 3 to 8 miles in the second hour. 
7 0
3 years ago
A rectangle has a length that is 5 inches more than the width Its perimeter is 50 inches. Find the length
Crazy boy [7]

Answer:

Length is 30 width is 20

Step-by-step explanation:

50 divided 2 is 25. Add 5 to 25. Then you have two parts. 30 and 20.

They are your answers.

4 0
3 years ago
The circle below has a center H. Suppose that m FG=42. Find the following.
Dahasolnce [82]

The measure of angle FHG = 42 degrees. This is the same as the arc length.

The measure of angle FEG = 21 degrees. This is half the value of the arc length.

5 0
3 years ago
Hshshdh pls awnser as soon as possible
gogolik [260]
Volume of sphere = 4/3(pi)(r^3)
Given pi = 3.14, r = 10
4/3(3.14)(10^3)
= 4186.66
Now round to hundredths

Solution: 4186.67 cubic meters
3 0
2 years ago
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