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 100← and 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(Round to four decimal places as needed.)View an example Get more help.→L34EDC520RIRTF5-VB6YH76N&7U17J*8M1CHIFBK(9FROL)O>F19P:;command optionClear allSPHFAS{[?1Check answerF12}deletereturnshif

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 antenna lengths of woodlice are approximately normally distributed with a mean of 0.25 inches and a standard deviation of 0.05 inches. What proportion of woodlice have antenna lengths that are at least 0.18 inches? Round your answer to at least four decimal places.
Which of the following statements is NOT correct about effects of scale changes for a data set? O a. When a constant of 3 is multiplied with every score value, the variance will increase by 9 Ob. When a constant of 3 is added to every score value, the variance will not change c. When a constant of 3 is multiplied with every score value, the standard deviation will increase by 3 d. When a constant of 3 is added to every score value, the standard deviation will increase by 3
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.
Given the following data for the number of units a sample of 12 students were enrolled in last semester. 14.5 15.0 8.0 13.5 14.0 12.0 16.0 19.5 13.0 15.0 9.5 6.0 Round all of your decimal results to two decimal places (round to the nearest hundredth). (a) Compute the MEAN for the sample of number of units enrolled. Mean = ___________ (b) Compute the STANDARD DEVIATION for the sample of number of units enrolled. Standard Deviation = ____________ (c) Identify the MODE for the sample data. Mode = ____________
The length of preg…
Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of 0.22 inches and a standard deviation of 0.05 inches. What proportion of woodlice have antenna lengths that are at most 0.18 inches? Round your answer to at least four decimal places.
Suppose that the heights of adult men in the United States are normally distributed with a mean of 70 inches and a standard deviation of 3.5 inches. What proportion of the adult men in the United States are at most 6 feet tall? (Hint: 6 feet 72 inches.) Round your answer to at least four decimal places.
Suppose that the heights of adult men in the United States are normally distributed with a mean of 69 inches and a standard deviation of 3 inches. What proportion of adult men in the United States is at least 6 feet tall? (Hint 6 feet=72 inches.) Round answer to at least 4 decimal places.
The results from a statistics class’ first test are as follows: The average grade obtained on the test by its 45 students is an 85, with a standard deviation of 15 points. Answer the following based on this information: a. Approximately how many people received a failing grade (less than 65) b. What percentage of people received a grade between a 70 and a 91? c. What percentage of individuals received a score whose z-score was -.70 or less? d. What grade is required in order to be in the top 15 percent? The top 10 percent? e. What percentage of people received a grade between 85 and 95? f. What percentage of people received a grade of 94 or less? g. What grade is required to be in the bottom 20%? h. What z-score is required to be in the top 40%? i. What percentage of individuals have a z-score between -1 and 1.40? j. What percentage of individuals have a z-score between 1.05 and 1.40?
In nutrition, the recommended daily allowance of vitamins is a number set by the government as a guide to an individual's daily vitamin intake. Actually, vitamin needs vary drastically from person to person, but the needs are very closely approximated by a normal curve. To calculate the recommended daily allowance, the government first finds the average need for vitamins among people in the population, and the standard deviation. The recommended daily allowance is then defined as the mean plus 2.5 times the standard deviation. What is the recommended daily allowance for a vitamin with mean u and standard deviation o? recommended daily allowance =

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