Given : The partial pressure of oxygen PaO2 is a measure ofthe amount of oxygen in the blood. Assume that the distribution ofPaO2 levels among newborns has a $\mu=$ 38 mmHg and $\sigma=$ 9 mmHg.

If we take a random sample n= 25 newborns, then using formula $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$ , we have

At x= 36

$z=\dfrac{36-38}{\dfrac{9}{\sqrt{25}}}\approx-1.11$

At x= 41

$z=\dfrac{36-38}{\dfrac{9}{\sqrt{25}}}\approx1.67$

Using table for z-values, the probability that the sample mean will be greater than 36 :

$P(z>-1.11)=1-P(\leq-1.11)=1-(1-P(z\leq1.11))=P(z\leq1.11)=0.8665004\approx0.8665$

The probability that the sample mean will be between 36 and 41 :-

$P(-1.11$

4 0

3 years ago

you earn $70 per week mowing lawns one week you work 10 hours during the week and spend $20 on gasoline for your mower how much

Basile [38]

Total income is $70/week. $20 of that goes towards the cost of gas. Thus, the net earnings were $50 for the week.

$50
------------------- = $5 per hour
10 hours

3 0

3 years ago

Simplify the expression.<br><br> 0.9 - 2(3r + 0.2)

I am Lyosha [343]

Answer:

-6r + .5

reeeeeeeeeeeeeeeeerrrrreeeeeeeeeeeere

3 0

3 years ago

Read 2 more answers

What is the factored from 3x+24y

IgorC [24]