Wednesday

July 30, 2014

July 30, 2014

Posted by **alexis** on Wednesday, March 27, 2013 at 5:08pm.

(a) In a random sample of 194 children taken more than a decade ago, what is the probability that 50 or more had high blood-lead levels? (Round your answer to three decimal places.)

- Stats -
**Steph**, Sunday, April 28, 2013 at 10:32pmn=194

P(r >/= 50)

p= .12 (converted percent to decimal)

q= 1-p = 1-.12 = .88

P(x) = r-.5 if r is to the left(greater than) therefore,

P(x>/= 49.5)

You need P(z>/= ?)

So:

mean (mu) = np = (194)(.12) = 23.28

stan. dev. (sigma) = sqrt(npq) = (194)(.12)(.88) = 4.526

z= (x - mu)/sigma = (49.5 - 23.28)/4.526 = 5.79

So: P(z >/= 5.79), now you look up the probability on your z-chart and there's your answer.

**Related Questions**

math - Lead Contamination More than a decade ago high levels of lead in the ...

Statistics - Suppose that more than a decade ago high levels of lead in the ...

statistics - In the following problem, check that it is appropriate to use the ...

Public Health - All of the following are true of lead as an environmental hazard...

public health - what does it means to have high levels of lead in your blood

statistics - studies indicate that drinking water supplied by some old lead-...

STATISTICS PLESE HELP!! - studies indicate that drinking water supplied by some ...

English - 1. We will lead your children to the joys of reading. 2. We will lead ...

Health (Ms. Sue) - 1. Identify why each of the following behaviors puts a teen ...

health - What are the health risks of consuming a high amount of sugar? A. High ...