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Kay [80]
3 years ago
10

Mean birthweight is studied because low birthweight is an indicator of infant mortality. A study of babies in Norway published i

n the International Journal of Epidemiology shows that birthweight of full-term babies (37 weeks or more of gestation) are very close to normally distributed with a mean of 3600 g and a standard deviation of 600 g. Suppose that Melanie is a researcher who wishes to estimate the mean birthweight of full-term babies in her hospital. What is the minimum number of babies should she sample if she wishes to be at least 95% confident that the mean birthweight of the sample is within 100 grams of the the mean birthweight of all babies? Assume that the distribution of birthweights at her hospital is normal with a standard deviation of 600 g.
Mathematics
1 answer:
goldenfox [79]3 years ago
6 0

Answer:

Step-by-step explanation:

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What is the question?

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4 years ago
3a-b=-9 -3a-2b=0 solve by elimination
anzhelika [568]

a = –2 and b = 3

Solution:

Given equations are

3a – b = –9 – – – – (1)

–3a – 2b = 0  – – – – (2)

To solve these equations by elimination method.

Elimination method means eliminating one variable to find the other variable.

Add equation (1) with equation (2), we get

3a – b + (–3a – 2b) = –9 + 0

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Combine like terms together.

⇒ 3a – 3a – b – 2b = –9

⇒ 0 – 3b = –9

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Divide by (–3) on both sides, we get

⇒ b = 3

Substitute b = 3 in equation (1), we get

(1) ⇒ 3a – b = –9

⇒ 3a – 3 = –9

Add 3 on both sides of the equation,

⇒ 3a = –6

Divide 3 on both sides of the equation

⇒ a = –2

Hence, a = –2 and b = 3.

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4 years ago
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-BARSIC- [3]

Answer:

(-5, 2).

Step-by-step explanation:

Working backwards

Move up 3 units (-5, 1)  --->  ( -5, 4)

Move down 2 units (-5, 4)  ----> (-5, 2).

7 0
3 years ago
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