You could factor a 7 out of 7 + 14 to get 7(1 + 2).
This would equal the same thing as 7 + 14, which is 21.
7 * 3 = 21.
21 can be factored like so:
1 * 21 = 21
3 * 7 = 21
The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.
That is,
Consider X be the length of the pregnancy
Mean and standard deviation of the length of the pregnancy.
Mean 
Standard deviation \sigma =15
For part (a) , to find the probability of a pregnancy lasting 308 days or longer:
That is, to find 
Using normal distribution,
Thus 
So 
Thus the probability of a pregnancy lasting 308 days or longer is given by 0.00256.
This the answer for part(a): 0.00256
For part(b), to find the length that separates premature babies from those who are not premature.
Given that the length of pregnancy is in the lowest 3%.
The z-value for the lowest of 3% is -1.8808
Then 
This implies 
Thus the babies who are born on or before 238 days are considered to be premature.
Answer:
maybe 90%?
Step-by-step explanation:
if im wrong im sorry
Answer:
LOOK AT THIS IT HAS ALL OF THE WORK
Step-by-step explanation:
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From the given data, you can see that the value that occur three times is. 42 and the smallest of the data is 13
<h3>What is stem and leaf plot?</h3>
A stem and leaf plot is a device for presenting quantitative data in a graphical format, similar to a histogram, to assist in visualizing the shape of a distribution.
From the given table, we will match the stem values to all the leaf values. The equivalent data from the stem and leaf plot are 13, 14, 17,19, 21, 23, 40, 42, 42, 42.
From the given data, you can see that the value that occur three times is. 42 and the smallest of the data is 13
Learn more on stem and leaf plot here: brainly.com/question/8649311
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