2. A reading exam was conducted for 4th grade children and 9th grade children. The 4th grade children have a mean of 25 and standard deviation of 5. The 9th grade children have a mean of 30 and standard deviation of 10. a. What percentage of 4th grade children score better than the average 9th grade children? b. What percentage of 9th grade children score worse than the average 4th grade children?

2. A reading exam was conducted for 4th grade children and 9th grade children. The 4th grade children have a mean of 25 and standard deviation of 5. The 9th grade children have a mean of 30 and standard deviation of 10. a. What percentage of 4th grade children score better than the average 9th grade children? b. What percentage of 9th grade children score worse than the average 4th grade children?

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A primary measure of dispersion for sample data is the sample standard deviation, s. Choose the best option to explain what the meaning of the sample standard deviation is, in general. A. The distance between one observation and the mean. B. The average distance of an observation from the middle of the distribution. C. The average distance between observations in the sample. D. The distance between the third and first quartiles.
A department store that bills its charge-account cus-tomers once a month has found that if a customer pays promptly one month, the probability is 0.90 that he orshe will also pay promptly the next month; however, if a customer does not pay promptly one month, the prob-ability that he or she will pay promptly the next month is only 0.40. (Assume that the probability of paying or notpaying on any given month depends only on the outcomeof the previous month.)(a) What is the probability that a customer who payspromptly one month will also pay promptly the nextthree months?(b) What is the probability that a customer who does notpay promptly one month will also not pay promptly thenext two months and then make a prompt payment themonth after that?
1. In a sentence or two, explain what a sampling distribution is. 2. In a sentence or two explain how the standard error of the mean is similar to the standard deviation.
7. A set of data has a variance of 81. What is the standard deviation? SAMSUNG
5.
If the mean snowfall for Ottawa Ontario Canada is 98 inches per year and the standard deviation is 25 inches what percentage of the time does Ottawa receive less than 125 inches of snow?
4. What is the standard deviation of the data {7, 1, 7, 10, 5, 3, 2}? 5.0 2.7 3.0 9.0
12. Stem and leaf Plot: (Sample )Variable: Gas $ Key: 12 = 1:2 1 : 2 2 : 3 : 4 : 5 : 55 6 : 7 : 88 8 : 9 12a. Use the above Stem and leaf plot and calculate the range. 12b. Use the above Stem and leaf plot and calculate the Quadratic Mean. 12c. Calculate the upper fence. 12d. Estimate the standard deviation.
n a Mathematics test, the mean is �=89.00 and the standard deviation �=5. What is the z-score for your score �=96
38. Pregnancy Lengths. Lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. a. What percentage of pregnancies last less than 250 days? b. What percentage of pregmancies last more than 300 days? (continued)
Given the following grades on s test: 86, 92, 100, 93, 89, 95, 79, 98, 68, 62, 71, 75, 88, 86, 93, 81, 100, 86, 96, 52; What is the percentage of scores lying within one standard deviation from the mean? Two standard deviations from the mean? Are these results consistent with what
• - Find the mean deviation for the following data set {7,23,11,44,46,23,28,30,32,43,47}