the following tables gives the life time of 500 CFL lamps
Life time : 9,10,11,12,,13,14,more than 14
No of lamp: 26, 71,82,102,89,77,53
total : 500
a bulb is selected at random . the probabilty that the life time fo the selected bulb is atmost 11 months is given by
After measuring 120 metres of rope, it was discovered that the metre rod was 3cm longer. The true length of the rope measured is
Option
a) 116m 40 cm
b) 121m 20 cm
c) 123m
d) 123 m 60 cm
One year ago a mother was 4 times older then her son. After 6 years, her age becomes more than double her sons age by 5 years. The present ratio of their age will be
the diameters of the top and the bottom portions of a bucket are 42cm and 28cm.respectively, if the height of the bucket is 24cm, then the cost of painting its outer surface @ of 50paise/cm square is ?