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nignag [31]
2 years ago
10

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Mathematics
1 answer:
Licemer1 [7]2 years ago
4 0

\huge \color{red}{ ꧁\mathrm{Answer}}꧂

The answer is 2112

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Consider a normal distribution curve where the middle 85 % of the area under the curve lies above the interval ( 8 , 14 ). Use t
NeTakaya

Answer:

\mu = 11

\sigma = 2.08

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.

Middle 85%.

Values of X when Z has a pvalue of 0.5 - 0.85/2 = 0.075 to 0.5 + 0.85/2 = 0.925

Above the interval (8,14)

This means that when Z has a pvalue of 0.075, X = 8. So when Z = -1.44, X = 8. So

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

-1.44 = \frac{8 - \mu}{\sigma}

8 - \mu = -1.44\sigma

\mu = 8 + 1.44\sigma

Also, when X = 14, Z has a pvalue of 0.925, so when X = 8, Z = 1.44

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

1.44 = \frac{14 - \mu}{\sigma}

14 - \mu = 1.44\sigma

1.44\sigma = 14 - \mu

Replacing in the first equation

\mu = 8 + 1.44\sigma

\mu = 8 + 14 - \mu

2\mu = 22

\mu = \frac{22}{2}

\mu = 11

Standard deviation:

1.44\sigma = 14 - \mu

1.44\sigma = 14 - 11

\sigma = \frac{3}{1.44}

\sigma = 2.08

7 0
2 years ago
Zach is 23 years old. zach's age is 3 years older than twice maya's age. let m represent maya's age. which equation can be used
Anna71 [15]
Z = 23
z = 2m + 3

23 = 2m + 3 <==
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2 years ago
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A distribution has a mean of 70.If 5 points are added to each individual score, the new mean would be
algol [13]

Answer:

well its free

Step-by-step explanation:

asdasdasdasd

3 0
1 year ago
Ms. Gardenault's fig tree was 12.78 centimeters tall on Monday. When the height of the plant was measured on Friday, the plant w
ella [17]

Explanation is in the file

tinyurl.com/wpazsebu

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3 years ago
PLZ HELP QUICK I NEED TO TURN THIS IN ;Twice a number is fourteen. Write and solve an equation to nd the number of miles that mu
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2n=14 n being the “number” divide 2 on both sides and you’re left w n=14/2 or7
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