Question

Q1: The mean of 7 numbers is 11. Five of the numbers are 3, 17, 20, 4 and 15. The remaining two numbers are each equal to y. Find
(i) the sum of the seven numbers,
(ii) the value of y.
Q2: The mean height of 20 boys and 14 girls is 161 cm. If the mean height of the 14 girls is 151 cm, find the mean height of the 20 boys.
Q3: Given that the mean of 16, w, 17, 9, x , 2, y, 7 and z is 11, find the mean of w, x, y and z

Answer 1

Answer:

Step-by-step explanation:

1. x/7=11

x=77

3+17+20+4+15+y+y=77

59+2y=77

2y=18

y=9

sum of seven numbers=77

2. 20b+14(151)/(20+14)=161

20b+2114=161*34

20b+2114=5474

20b=3360

b=168

3.  16+w+17+9+x+2+y+7+z=11*9=99

51+x+y+z+w=99

x+y+z+w=99-51

x+y+z+w=48

mean

(x+y+z+w)/4=48/4=12

Answer 2

Answer:

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