10.the mean of 15 numbers is 5. If 2 is added to each number, then The what will be the new mean?
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Answer:
new mean is 7
Step-by-step explanation:
given that
mean of 15 no. is 5
mean= sum of observation/no.of observation
5=sum of observation/15
sum of observation= 5×15= 75
now, 2 is added in each no.
which means in total 2×15 is added to sum of observation
so new sum of observation= 75+30= 105
new mean=105/15 (no change in no. of observation)
new mean= 7
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