Question

The arithmetic mean between a and 10 is 40, the value of ‘a’ should be Select one: a. 50 b. 60 c. 45 d. 70

Answer 1

Answer:

the arithematic mean b/w a and 10 is 40 then value of a is 70

A.M=a+10/2=40

a+10=40x2

a+10=80

a=80-10

a=70

so answer is 70

Answer 2

Answer:

Correct answer is option d. 70

Step-by-step explanation:

Given problem  

The arithmetic mean between a and 10 is 40, the value of ‘a’ should be Select one: a. 50 b. 60 c. 45 d. 70

given that arithmetic mean of a and 10 = 40

we know that arithmetic mean of the data

                     = (sum of observations)/ number of observations  

therefore mean of a and 10 =  a + 10 / 2

                     $\frac{a+10}{2} = 40$  

                    a + 10 = 80

                    a = 80 - 10 = 70

the correct answer is option d. 70