The cholesterol levels of an adult can be described by a normal model with a mean of

190

mg/dL and a standard deviation of

26.

Question content area bottom

Part 1

a) Draw and label the normal model.

A.

138

86

34

294

242

346

190

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 34 to 346 plus in intervals of 52 begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 190, and decreases at an increasing and then decreasing rate approaching the horizontal axis. The curve is symmetric. The area below the curve is subdivided into regions by the intervals and labeled as follows: from 138 to 242, "68%"; from 86 to 294, "95%"; from 34 to 346, "99.7%."

B.

177

164

151

216

203

229

190

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 151 to 229 plus begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 190, and decreases at an increasing and then decreasing rate approaching the horizontal axis. The curve is symmetric. The seven equally spaced horizontal axis labels are as follows, listed here from left to right: 151, 164, 177, 190, 203, 216, 229. The area below the curve is subdivided into regions by the intervals and labeled as follows: from 177 to 203, "68%"; from 164 to 216, "95%"; from 151 to 229, "99.7%."

C.

164

138

112

242

216

268

190

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 112 to 268 plus in intervals of 26 begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 190, and decreases at an increasing and then decreasing rate approaching the horizontal axis. The curve is symmetric. The area below the curve is subdivided into regions by the intervals and labeled as follows: from 164 to 216, "68%"; from 138 to 242, "95%"; from 112 to 268, "99.7%."

Part 2

b) What percent of adults do you expect to have cholesterol levels over

210

mg/dL?

enter your response here%

(Round to two decimal places as needed.)

Part 3

c) What percent of adults do you expect to have cholesterol levels between

140

and

160

mg/dL?

enter your response here%

(Round to two decimal places as needed.)

Part 4

d) Estimate the interquartile range of cholesterol levels.

IQR=enter your response here

mg/dL

(Round to the nearest integer as needed.)

Part 5

e) Above what value are the highest 15% of adults' cholesterol levels?

enter your response here

mg/dL