The mean height of 11 friend is 155.2 cm is one friend whose height is 158 cm leaves find the new mean height
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Sum=Mean × Number
= 155.2 × 11
= 1707.2
New mean = (1707.2-158)/10
= 155.2 × 11
= 1707.2
New mean = (1707.2-158)/10
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