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Katena32 [7]
3 years ago
11

X^2+4x-11=0 what is the solution set?

Mathematics
1 answer:
Sauron [17]3 years ago
5 0

Answer:

The solution set can be calculatedby the following steps;

Step-by-step explanation:

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A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

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 = 1200, \sigma = 60

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

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

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

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

4 0
3 years ago
What is the value of x, given that figure LMNO is a square? A. 45 B. 33 C. 27 D. 81
Degger [83]
The is answer is B. 33
8 0
3 years ago
MARKING BRAINLIEST!
Irina-Kira [14]

Answer: Felix has a job that pays 100 dollars an hour,  If he makes 2500 dollars a week how many hours does he work each day.

100x = 2500

hope this helps mark me brainliest please

6 0
3 years ago
I WILL MARK BRAINLIST help asap 7grade math!!!!
Ymorist [56]
-4/5 and -1/2
Taking the LCM of the 2 fractions we get the common denominator 10

-8/10 and - 5/10

Now we can see the second fraction (-5/10) is bigger
Thus the friend is wrong
8 0
3 years ago
I need all I don't know how to do????
Ghella [55]
Need the answers to all the questions?

6 0
3 years ago
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