Mathematics
The mean age of nine boys is 28 years and if one new boy joins them the mean age increases by one.
Assertion(A): The age of new boy is (29 x 10 - 28 x 9) years.
Reason(R): The age of new boy is (29 - 28) x 10 years.
A is true, R is false.
A is false, R is true.
Both A and R are true and R is correct reason for A.
Both A and R are true and R is incorrect reason for A.
Related Questions
The median of first six prime numbers is :
5
7
6
7.5
The inter quartile range for the given ogive is :
42
32
44
54
C.I. 0 - 10 10 - 20 20 - 30 Frequency 15 25 b Cumulative frequency 15 a 50 Assertion(A): a = 15 + 25 = 40
b = 50 - a
Reason(R): a + 15 = 25
and b = 50 - 10
A is true, R is false.
A is false, R is true.
Both A and R are true and R is correct reason for A.
Both A and R are true and R is incorrect reason for A.