The mean of 50 observations was 36. It was found later that an observation 48 was wrong the corrected new mean is
A. 35.2
B. 36.1
C. 36.5
D. 39.1
The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students 10 years and that of the other 9 students is 16 years. The age of the 15th student is ________
A. 11 years
B. 14 years
c. 15 years
D. 15 2/7 years
The substances through which current cannot pass are called:
A. Conductors
B. Non-metal
C. Semi-conductors
D. Insulator