The Mental Development Index (MDI) of the Bayley Scales of Infant Development is a standardized measure used in observing infants over time. It is approximately normal with a mean of 100and a standard deviation of 16. Complete parts a through c..@a. What proportion of children has an MDI of (i) at least 130? (ii) at least 90?(i) The proportion of children having an MDI of at least 130 is 0.0301(Round to four decimal places as needed.)2View an example Get more help -(ii) The proportion of children having an MDI of at least 90 is 0.7357.(Round to four decimal places as needed.)b. Find the MDI score that is the 98th percentile.WSThe 98th percentile MDI score is.(Round to two decimal places as needed.)d*X#3D20F3$gag14RFYoCV%5TG6BF6YH&NF7U8DilFB1M9KDDF10HBTOLcommandClear allP:2F11[option?Check answerISE1.4)F12delete1

the mean 100the standard deviation 16

Answered: The Mental Development Index (MDI) of…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Suppose that the heights of adult men in the United States are normally distributed with a mean of 69.5 inches and a standard deviation of 2.5 inches. What proportion of the adult men in the United States are less than 6 feet tall? (Hint: 6 feet 72 inches.) Round your answer to at least four decimal places.
An investigation of the relationship between traffic flow (measured in cars per day) and lead content (measured in micrograms per gram of dry weight) in the bark of trees near the highway yielded the following summary statistics: Sample Mean Sample Standard Deviation Lead Content (micrograms per gram dry weight) 680 240 Traffic Flow (cars / day) 1750 800 The correlation between lead content and traffic flow was found to be r = 0.6 and a scatterplot showed the form to be linear. Based on context, which is the X-variable and which is the Y-variable? Group of answer choices X-variable Y-variable
Rachael got a 660 on the analytical portion of the Graduate Record Exam (GRE). If GRE scores are normally distributed and have mean μ = 600 and standard deviation σ = 30, what is her standardized score?
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For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 38 beats per minute, the mean of the listed pulse rates is x=79.0 beats per minute, and their standard deviation is s=22.1 beats per minute. a. What is the difference between the pulse rate of 38 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 38 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between −2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 38 beats per minute significant?
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