What is the efficiency of Fuel cell?
70-75%
95%
80-85%
90%
What is the mean of 70, 75, 80, 85, and 90?
Find the mean, variance and standard deviation using short-cut method
Height in cm70−7575−8080−8585−9090−9595−100100−105105−110110−115No. of children3477159663