1.The following frequency distribution of marks has mean 4.5.MarkI2342Frequency496(a)Find the value of x.146 15x2+8+18 +36 +5x +54 + 282+4+6+9rxegey94 +x(b) Write down the standard deviation.1.562.The following table gives the examination grades for 120 students.GradeNumber of students1922535911(a)345Find the value ofp: 34 +35 - 69(ii) q. 109-69 = 40(b) Find the mean grade.3.16(c) Write down the standard deviation.1.0925x674= 1.5146 +5x-153 +4.50.5x²7x = 14Cumulative frequency934Р109120

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Answered: 1. The following frequency distribution…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A sample of 33 households from a survey generates the following frequency table of household income (in thousands). Find the mean and standard deviation. X = Interval Frequency 0-29 30-59 60-89 90-119 120-149 150-179 180-209 thousand dollars. (Round to one decimal place as needed.) 342NO-3 13 10 0 1
- (: Question : ). None Q1 / From the following frequency distribution table: Frequencies Categories 33-37 10 38-42 12 43-47 51 48-52 30 53-57 8 Required: 1- The harmonic mean. 2- The mediator 3- the mode. 4- Standard deviation 5- Draw the frequency curue.
2.2 In a population, the correlation coefficient between family income and child IQ is 0.30. The mean family income was $60,000. The standard deviation in income is $20,000. IQ is measured on a scale such that the mean is 100, and the standard deviation is 15. (a) Using this information, predict the expected IQ of a child whose family income is $70,000 (b) How reliable do you expect this prediction to be? Why? (your answer should be a property of correlation, not an opinion about IQ) (c) The family income now rises-does the correlation predict that the child will have a higher IQ? Why?
Find the standard deviation using 2 methods. And identify it is a grouped data or ungrouped data
THE FF. WERE THE RESULTS OF THE EXAMINATION CONDUCTED FOR GRADUATING STUDENTS. FIND THE STANDARD DEVIATION (USE 4 DECIMAL PLACES)
Solve for the:1. Mean2. Median3. Mode 4. Standard Deviation
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Nn.39. Subject :- Advance Mathematic
One of the z-score formulas will help on this question. Scores on the SAT test are normally distributed with a mean of 500 and standard deviation of 100 points. Pretend someone scored 400 on the math portion of the SAT test. What would be the z-score cut off for this score? A. 1.0 B. -1.0 C. 0 D. 2.0
1.For the scores given below, please compute range, Standard deviation, and variance. You must use the table given below. (X-Mean) (X-Mean)² 2 1 4 4 4 ΣΧ = Mean = ΣΧ/Ν Mean = Variance points) Formula Steps Variance = Standard deviation points) Formula Steps Standard deviation = Range point) Formula Steps Range

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1. The following frequency distribution of marks has mean 4.5. Mark 1 3 Frequency 2 6 (a) Find the value of x. 2+8+18 +36 +5x +54 +88 2+4+6+9rx+gey (b) Write down the standard deviation. 1.56 24 4 5 X 9 1465x 94 4x 6 6 7 4 = 1.5 146 +5x-153 +4.5 0.5x=7 x 14