Question

181CJI Udalu!
9. The mean of numbers 20, 30, 40, x, x+10, 70, 80, 90, is 110. Find the missing numbers.​

Answer 1

Answer:

The missing numbers are 270 and 280.

Step-by-step explanation:

Solution:-

Mean = 110

Sum of the terms/number of terms=110

20+30+40+x+x+10+70+80+90/8 = 110

2x+340/8=110

2x+340=880

2x=880-340

2x=540

x=540/2

x=270

x+10=280

Answer 2

$\huge{\boxed{\rm{\red{Answer=270 and 280}}}}$

Step-by-step explanation:

Given:-

The mean of numbers 20, 30, 40, x, x+10, 70, 80, 90, is 110.

To find:-

Find the missing numbers.

Solution:-

Given numbers are 20,30,40,x,x+10,70,80,90

Number of all observations=8

Sum of all observations

=20+30+40+x+x+10+70+80+90

=340+2x

Mean =110

Mean=Sum of all observations / No. of all observations

=>110=(340+2x)/8

=>340+2x=110×8

=>340+2x=880

=>2x=880-340

=>2x=540

=>x=540/2

=>x=270

now x+10=270+10=280

Answer:-

The missing numbers are 270 and 280