Question

If the mean of x, x + 3, x + 5, x + 7 and x + 10 is 9 then what is the means of last three observations? (a)9 4/5 (b)10 1/2 (c) 11 1/3 (d) 12

Answer 1

Answer:

C)11 1/3

Step-by-step explanation:

We can find mean of 5 numbers by-

=>x+x+3+x+5+x+7+x+10/5=9

=>5x+25=45

=>5x=20

=>x=4

Therefore, the value of the last three observations are-

x+5=4+5=9

x+7=4+7=11

x+10=4+10=14

Thus the mean is-

9+11+14/3

=34/3=11 1/3

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