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

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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