Answered: b) What percent of adults do you…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

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

195

mg/dL and a standard deviation of

25.

a) Draw and label the normal model.

170

145

120

245

220

270

195

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 120 to 270 plus in intervals of 25 begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 195, 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 170 to 220, "68%"; from 145 to 245, "95%"; from 120 to 270, "99.7%."

183

170

158

220

208

233

195

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 158 to 233 plus begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 195, and decreases at an increasing and then decreasing rate approaching the horizontal axis. The curve is symmetric. The seven similarly spaced horizontal axis labels are as follows, listed here from left to right: 158, 170, 183, 195, 208, 220, 233. The area below the curve is subdivided into regions by the intervals and labeled as follows: from 183 to 208, "68%"; from 170 to 220, "95%"; from 158 to 233, "99.7%."

145

295

245

345

195

68%

95%

99.7%

A bell-shaped curve with horizontal axis from less than 45 to 345 plus in intervals of 50 begins just above the horizontal axis, increases at an increasing and then decreasing rate to its maximum at 195, 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 145 to 245, "68%"; from 95 to 295, "95%"; from 45 to 345, "99.7%."

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

210

mg/dL?

nothing%

(Round to two decimal places as needed.)

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

160

and

180

mg/dL?

nothing%

(Round to two decimal places as needed.)

d) Estimate the interquartile range of cholesterol levels.

IQR=nothing

mg/dL

(Round to the nearest integer as needed.)

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

nothing

mg/dL

(Round to the nearest integer as needed.)

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