Question

Class interval. frequency. cf

90-100. 5. ?
100-110. 2
110-120. 3
120-130. 8
130-140. 8
140-150. 6


calculate median​

Answer 1

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Find mean, median and modemore than 150 [ 140 130 . 120 . 110 100 . 90 . 80 ][ Frequency 0 . 12 . 27 . 60 . 105 . 124 . 141 150 ]

Question

Find mean, median and mode

more than - 150 140. 130. 120. 110. 100. 90. 80

Frequency - 0. 12. 27. 60. 105. 124. 141 150

Solution

Byselectingclassesforthegivendataas:80−90,90−100,100−110,110−120,120−130,130−140,140−150Wewritethefrequencydistributionasbelow:

Class interval (C.I) Frequency (f) Cumulative Frequency (c f)

80 - 90 150 - 141 = 9 9

90 - 100 141 - 124 = 17 26

100 - 110 124 - 105 = 19 45

110 - 120 105 - 60 = 45 90

120 - 130 60 - 27 = 33 123

130 - 140 27 - 12 = 15 138

140 - 150 12 - 0 = 12 150Hence,n= 150