Question

the arithmatic mean of 6 numbers is 52. If one more number is included the mean of new set of numbers become 51 find the included number​

Answer 1

Answer:

45

Step-by-step explanation:

Case I

let the sum of 6 numbers be x

mean of 6 numbers is 52

=> x / 6 = 52

=> x = 52 × 6 = 312 _________(I)

Case II

let the sum of 7 numbers be y

mean of new set of numbers become 51

=> y / 7 = 51

=> y = 51 × 7 = 357 __________(ll)

(l) - (ll) ,

=> x - y = 357 - 312

= 45

Hope this will help you.