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Inessa05 [86]
3 years ago
12

The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. a. Find the pro

bability of a pregnancy lasting 307 days or longer. b. If the length of pregnancy is in the lowest 2​%, then the baby is premature. Find the length that separates premature babies from those who are not premature.
Mathematics
1 answer:
Bogdan [553]3 years ago
4 0

Answer:

Step-by-step explanation:

Let X be the length of pregnancy.

X is N(268, 15)

a) Prob of pregnancy lasting 307 days or longer

= P(X>307) = P(Z>\frac{307-268}{15} )\\=P(Z>2.6)\\

=0.5-0.4953

=0.0047

b) Lowest 2% is 2nd percentile

Z=-2.55

X score = 268-2.55(15)

= 229.75 days

If length of days >230 days then it is not premature.

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iren2701 [21]

Answer:

7 & a half hours

Step-by-step explanation:

390÷52= 7.5hr or 7 & a half hours

5 0
3 years ago
Read 2 more answers
I need help with this ASAP PLEASE!!!
Alja [10]

The correct answer is one

good luck in math

       

7 0
3 years ago
If the rate of change of the graph of a linear equation is 4 and the y-intercept is (0, 8), what is the linear equation that rep
serg [7]

Answer:

y = 4x + 8

Step-by-step explanation:

The linear equation can be written in the form y = mx + b. "y" and "x" stay as they are. The "m" is the slope or rate of change. The b is the y-intercept.

Hope it helps!!!

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7 0
3 years ago
-4/9n ÷ 1/15n please help w/explanation and step by step​
Sindrei [870]

Answer:

-20n/3n

Step-by-step explanation:

-4       1

---   /    ---

9n       15n

Keep, change, flip

- Keep the -4/9n

- Change the division sign to a multiplication sign

- Flip the 1/15n to 15n/1

-4       15n

---   *    ---

9n       1

Cross simplify.

9n divided by 3 is 3n.

15n divided by 3 is 5n.

-4       5n

---   *    ---

3n       1

-4 times 5n equals -20n

3n times 1 equals 3n

-20n      

---  

3n

6 0
3 years ago
The diagram shows the width and height of a table. Mr. Howell wants to build a table with the same ratio of width and height as
just olya [345]

Based on the diagram and the ratio of width and height in it, the width that Mr. Howell should make his table is 48 inches .

<h3>How wide should Mr. Howell's table be?</h3>

The width of the table in the diagram is 12 cm and the height is 6cm.

This means that the ratio of width to height is:

12 : 6

2 : 1

As Mr. Howell wants his table to be 24 inches high, the width of the table would be:

2 : 1

x  : 24

Cross-multiply to get:

x = 48 inches

Find out more on ratios at brainly.com/question/20594266

#SPJ1

4 0
2 years ago
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