Answer:
Step-by-step explanation:
Answer:
2.71428571429
Step-by-step explanation:
calculator, counted it myself too to check if it's right
2.71428571429
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Answer:
x=4+(19)^1/2,x=4-(19)^1/2
Step-by-step explanation:
Answer: 28
Step-by-step explanation:
The mean of 15 numbers = 12
Then , the sum of the numbers = 12x15 = 180
Let the extra number included be
, then
The new sum = 
And the new total number will increase from 15 to 16
new mean = 13 , so we have :





therefore , the extra number is 28