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lora16 [44]
3 years ago
10

In 2015, there were roughly 1x10^6 high school football players and 2x10^3 professional football players in the United States.

Mathematics
1 answer:
melisa1 [442]3 years ago
5 0

Answer:

500.

Step-by-step explanation:

(1 * 10^6) / (2 * 10^3)

= 1/2 * 10^6/10^3

= 0.5 * 10^3

= 5 * 10^2

= 500.

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The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with a
Naya [18.7K]

Answer:

P(X<240)=0.0521

P(240<X<270)=0.5466

280 days

Step-by-step explanation:

we are given the following information

mean=μ=266 days

standard deviation=σ=16 days

P(X<240)=P(X-μ/σ<240-266/16)=P(z<-1.625)

This probability can either be determined by utilizing normal distribution table or using Excel.

Using Excel function <em>NORM.S.DIST(-1.625,TRUE)</em> we get

P(X<240)=0.0521

P(240<X<270)=P((240-266)/16<X-μ/σ<(270-266)/16)=P(-1.625<z<0.25)

P(-1.625<z<0.25)=P(z<0.25)-P(z<-1625)

Using Excel function

<em>NORM.DIST(270,266,16,TRUE)-NORM.DIST(240,266,16,TRUE)</em> we get

P(240<X<270)=0.5466

P(X>x)=0.20

P(z>(x-266)/16)=0.20

Using Excel function <em>NORM.INV(0.8,266,16)</em> we get

x=280

<em>OR</em>

P(X>x)=0.2

The area to the right of x is 0.2 and the area between mean and x is

0.5-0.2=0.3

Looking for 0.3 in the normal distribution table we don't find 0.3 but the closest value is .3023 and it corresponds to z-value 0.85.

z=0.85

z=x-μ/σ

σ*z+μ=x

x=16*0.85+266

x=279.6≅280

The longest 20% of pregnancies lasts 280 days

4 0
3 years ago
Which graph shows the solution to the system of linear inequalities
inn [45]

The answer is:

B

Explanation:

I took the test

8 0
3 years ago
Read 2 more answers
Which is more heavy a pound of bricks or a pound of feathers​
jekas [21]

Answer:

they are the same weight, a pound

5 0
3 years ago
Vol=1348.79cm³. What's X? (Height)
ale4655 [162]
V = PI x r^2 x H

1348.79 = 3.14 x 5.5^2 x H

1348.79 = 94.985 x h
h = 1348.79 / 94.985
h = 14.2 cm  ( round answer if needed)


4 0
3 years ago
(20 points) <br><br><br><br> NEED ANSWER ASAP
geniusboy [140]
The first step would be D
3 0
3 years ago
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