Flavonoids found in green, black, or white tea may reduce the risk of heart dise

Question

Flavonoids found in green, black, or white tea may reduce the risk of heart disease by decreasing low-density lipoproteins, also known as LDL or bad cholesterol. A health psychologist is interested in helping her patients with bad cholesterol make good lifestyle choices. Low-density lipoprotein levels follow a normal distribution with 100 and ? 32. Use the Distributions tool to help answer the questions that follow. Note: To find the probability above or below a z-score, click on the normal curve icon with one line, and position the line at the appropriate z-score on the horizontal axis. The areas under the standard normal curve above and below the z-score will be displayed to the left and right of the vertical line, respectively. To find the probability between two z-scores, click on the normal curve icon with two lines, and position the left line at the lower z-score and the right line at the higher z-score. The area under the normal curve between the vertical lines will be displayed in blue Standard Normal Distribution Mean-0.o Standard Deviation-1.0 -2 -1 2

Explanation / Answer

1)the minimum z score necessary.,.........is z =1.645

2)X =100+1.645*32 =152.64

3)P(130<X<159)=P((130-100)/32<Z<(159-100)/32)=P(0.94<Z<1.84)=0.9671-0.8264=0.1407 ~14.07% is correct option

4)

P(X<100)=P(Z<0) =50%

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