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Bingel [31]
3 years ago
8

1/4 times 8/8 what is the answer to this problem

Mathematics
1 answer:
Ann [662]3 years ago
7 0
\frac{1}{4}
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Twenty five heat lamps are connected in a greenhouse so, that when one lamp fails, another takes over immediately (only one lamp
olga55 [171]

Answer:

P = 0.006

Step-by-step explanation:

Given

n = 25 Lamps

each with mean lifetime of 50 hours and standard deviation (SD) of 4 hours

Find probability that the lamp will be burning at end of 1300 hours period.

As we are not given that exact lamp, it means we have to find the probability where any of the lamp burning at the end of 1300 hours, So we have

Suppose i represents lamps

P (∑i from 1 to 25 (X_i > 1300)) = 1300

= P(X^{'}> \frac{1300}{25})                  where X^{'} represents mean time of a single lamp

= P (Z> \frac{52-50}{\frac{1}{\sqrt{25}}})                Z is the standard normal distribution which can be found by using the formula

Z = Mean Time (X^{'}) - Life time of each Lamp (50 hours)/ (SD/\sqrt{n})

Z = (52-50)/(4/\sqrt{25}) = 2.5

Now, P(Z>2.5) = 0.006 using the standard normal distribution table

Probability that a lamp will be burning at the end of 1300 hours period is 0.006

4 0
3 years ago
If ab is 2x+3 bc is 3x+5 and ac is 38 what is the value of x
ohaa [14]

Answer:

x would equal 8. because you would add AB and BC together and set it equal to AC

Hoped I helped

Can I get a brainliest

3 0
3 years ago
Hgarage hhhhhjjjhjjjjjjhhhhhhh​
julia-pushkina [17]
Felt

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5 0
3 years ago
Read 2 more answers
A= h(b+c) solve for b
madreJ [45]
A=h(b+c)
A/h=b+c
b=(A/h)-c

Answer: b=(A/h)-c
7 0
2 years ago
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A gumball machine has 330 red gumballs. If the red gumballs are 75% of the total number of gumballs, how many gumballs are in th
patriot [66]
75% = 330 gumballs

Find 1%:
1% = 330 ÷ 75 = 4.4 gumballs

Find 100%:
100% = 4.4 x 100 = 440 gumballs.

Answer: 440 gumballs.
3 0
3 years ago
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