Question

The mean of 5 no;s is 20.If one no is included the new mean is 25 Included no is​

Answer 1

Answer:

Step-by-step explanation:

let the numbers be = x₁ , x₂,x₃,x₄,x₅

so their mean is = (x₁+x₂+x₃+x₄+x₅)/5

20 = (x₁+x₂+x₃+x₄+x₅)/5

100 = x₁+x₂+x₃+x₄+x₅

let the included no. be x₆

so new mean = (x₁ + x₂+x₃+x₄+x₅+x₆)/6

25 = (x₁+x₂+x₃+x₄+x₅+x₆)/6

150 = x₁+x₂+x₃+x₄+x₅+x₆

150 = 100+x₆

x₆=50