Question

question no. 11, 12,13 and 14..urgent

Answer 1

mean equals sum of all terms by no of terms

Answer 2

Answer:

Q11 8500

Q12 18

Q13 41

Q14 38.25

Step-by-step explanation:

Q11 Sum of first three members' income is 3 x 8000 = 24000.  Together with fourth member, new total is 24000 + 10000 = 34000.  The mean is then 34000 / 4 = 8500.

Q12 Sum of ages of first four is 13.25 x 4 = 53.  Sum of ages of all six is 14.5 x 6 = 87.  So the last two have ages that add up to 87 - 53 = 34.  As one of them is 16, the other is 18.

Q13 Total of the weights of all 16 is 40 x 16 = 640.  Removing the one student, the new total is 640 - 25 = 615.  As there are now only 15 students, the new mean weight is 615 / 15 = 41.

Q14 Total weight of boys is 40 x 26 = 1040.  Total weight of girls is 35 x 14 = 490.  So the total weight of the 26 + 14 = 40 students is 1040 + 490 = 1530, giving a mean of 1530 / 40 = 38.25.