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erik [133]
3 years ago
12

Chapter 11 lesson 1 math homework math in my world

Mathematics
1 answer:
kvv77 [185]3 years ago
7 0
I’m sorry but what???
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B or c because its lower than the denominator
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A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours. Approximately what percent o
Svetach [21]

Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

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

  • The z-score measures how many standard deviations the measure is above or below the mean.
  • Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

In this problem, we have that the mean and the standard deviation are given, respectively, by:

\mu = 400, \sigma = 30.

The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:

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

Z = \frac{420 - 400}{30}

Z = 0.67

Z = 0.67 has a p-value of 0.7486.

1 - 0.7486 = 0.2514.

0.2514 = 25.14% of the batteries will last more than 420 hours.

More can be learned about the normal distribution at brainly.com/question/24663213

#SPJ1

3 0
2 years ago
Estimate the Circumference of this circle.<br> 10m
Rina8888 [55]

Answer:

62.8

Step-by-step explanation:

10*2=20

20*3.14= 62.8

HOPE IT HELPS

7 0
3 years ago
Determine if the given information would form a
aleksklad [387]

Answer:

The answer is a unique triangle.

Step-by-step explanation:

9+7=16, 16 is less than 18.

If two sides are added up and equal or are less than the third side, they are a unique triangle.

8 0
3 years ago
In a survey, 540 people, or 80%, said they attended a movie at least once a month. How many people were surveyed?
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X = total amount of people

80% of x = 540
.8x = 540
x = 675

There were 675 people
8 0
3 years ago
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