The mean of the given data is 84. If 6 is added to each observation and then divided then by 9, the new mean is?
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if 6 is added to each observation mean will increase by 6 and when it is divided by nine mean also wil be divided by 9
therefore ,
new mean = (old mean +6)÷9
=(84+6)÷9=90÷9
=10
therefore ,
new mean = (old mean +6)÷9
=(84+6)÷9=90÷9
=10
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