Question

The average of 7 numbers is 38. If the sum of first 6 numbers is 216 then the 7th number is​

Answer 1

Answer:

let the 7th no. be X

average = Sum of observations/no. of observation

average of 7 numbers = 38

Therefore,

38 = 216 + X / 7

38 × 7 = 216 + X

266 = 216 + X

266 - 216 = X

50 = X

Hence, the value of 7th no. is 50

Step-by-step explanation:

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Answer 2

Here it is given that the average of 7 numbers is 38.

Sum of first six numbers = 216

We have to find the 7th number

Let us assume the 7th number be 'x'

We should know the formula to calculate average

The average is calculated by dividing the sum of all the numbers by total numbers

$average = \frac{sum of all the numbers}{total numbers}$

Sum of all the numbers = 216 + x

total numbers = 7

$38 =\frac{216+x}{7} \\266=216+x\\x=266-216\\x=50$

Therefore, the 7th number will be 50