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mylen [45]
3 years ago
5

Suppose medical records indicate that the length of newborn babies(in inches) is normally distributed with a mean of 20 and a st

andard deviation of 2.6 find the probability that a given infant is between 14.8 and 25.2 inches long

Mathematics
2 answers:
inna [77]3 years ago
6 0

Answer: 95

Step-by-step explanation:

Hope this helps!

Nadusha1986 [10]3 years ago
4 0

Answer:

P=0.954 or 95.4%

Step-by-step explanation:

Using the formula for the standardized normal distribution to find Z:

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

Where μ is the mean (μ=20) and σ is the standard deviation (σ=2.6).  

Z_{1} =\frac{14.8-20}{2.6}=-2.0

Z_{1} =\frac{25.2-20}{2.6}=2.0

In the table of the normal distribution, we can look for positive values z, and these values are going to represent the area under the curve between z=0 and the values searched. the negatives values are found by symmetry (with the corresponding positive value but remember this area is under the left side of the curve).  To find a value in the table, find the units in the first column and the follow over the same row till you find the decimals required.

P_1=0.4772

P_2=0.4772

P_1 represents the probability of length being between 14.8 and 20 (the mean) and P_2 represents the probability of length being between 20 and 25.2, The requested probability is the sum of these two.

P=P_1+P_2=0.954

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8 0
3 years ago
The heights of adult males in the United States are approximately normally distributed. The mean height is 70 inches (5 feet 10
steposvetlana [31]

Using the normal distribution, it is found that the probability is 0.16.

<h3>Normal Probability Distribution</h3>

In a normal distribution with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

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

  • It 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, which is the percentile of X.

In this problem, the mean and the standard deviation are given by, respectively, \mu = 70, \sigma = 3.

The proportion of students between 45 and 67 inches is the p-value of Z when <u>X = 67 subtracted by the p-value of Z when X = 45</u>, hence:

X = 67:

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

Z = \frac{67 - 70}{3}

Z = -1

Z = -1 has a p-value of 0.16.

X = 45:

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

Z = \frac{45 - 70}{3}

Z = -8.3

Z = -8.3 has a p-value of 0.

0.16 - 0 = 0.16

The probability is 0.16.

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

3 0
2 years ago
Extra points <br><br> not in words
Mashcka [7]
Step^1: 6 - 1 - 2(n) + 5 \\ Step^2: 2(n) = 0 \\ Step ^3: \frac{2n}{0} = 0 ; \\ Step^4 \frac{0}{0} = 0 \\ Step^5:Answer : n = 0 \\ Step^6: Number Of Solutions: 1Solution
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6 0
3 years ago
Im struggling with this one as well could someone help out?
guapka [62]
The reflection is happening over the x axis (horizontal axis)

Any y coordinate that is positive turns negative, and vice versa

For example: (1,2) ---> (1,-2)

In general, the rule is (x,y) ---> (x,-y)

So the answer is choice C
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3 years ago
Need help<br>No web link<br><br>Simplify <br><br>​
Damm [24]

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x^2a + a + 2b - b + 2c + c =

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8 0
3 years ago
Read 2 more answers
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