Question

The average of two number is 20 and standard divination is 5. Find the two numbers.​

Answer 1

let x1 and x2 be the required numbers

given mean is 20

x1 + x2 = 40________(1)

Standard deviation is 5

complete root over =>[(x1−20)2+(x2−20)2]/2−−−−−−−−−−−−−−−−−−−−−√=5−−−−(2)

solving 1 and 2, x1=15 or x1=25 and x2=25 or x2=15

Thus, required numbers are 15 and 25 and the solution is unique

hope you understand:)