shymitch32

29.08.2019 • 

Mathematics

In the united states, birth weights of newborn babies are approximately normally distributed with a mean of μ = 3,500 g and a standard deviation of σ = 500 g.
what percent of babies born in the united states are classified as having a low birth weight (< 2,500 g)? explain how you got your answer.
the answer is:
the z-score for 2,500 g is –2.according to the empirical rule, 95% of babies have a birth weight of between 2,500 g and 4,500 g.5% of babies have a birth weight of less than 2,500 g or greater than 4,500 g.normal distributions are symmetric, so 2.5% of babies weigh less than 2,500g.

Ответ:

babycakesmani

01.01.2022

Mathematics

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First, we sketch this information on a normal distribution graph as shown below

We are looking to find the probability of baby weight <2500gram

We need to standardize the value 2500




Next, we need to look at the z-table. If your table only shows value for Z<z, then use the property of symmetry. It's shown in the last diagram. We read the probability of  P(z<2)=0.9772, then we do  to obtain the area to the right of , which is the same size with the area of 



Which means the percentage of baby with weight <2500 is 0.0228×100=2.28%

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Ответ:

cxttiemsp021

13.07.2021

Mathematics

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52

Step-by-step explanation:I=PRT

P=130

R=0.1

T=4

I=130(0.1)(4)  

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