Question 7
A student carried out an experiment to compare the lifetime of two types of light bulbs. She obtained the following results:
a. The lifetime of type A bulbs are 140, 125, 135, 141, 135, 142 and 123 days.
b. The lifetime of type B bulbs are 135, 125, 145, 122 and 139 days.
Which type of light bulb has a longer lifetime? Why?
a. The lifetime of type A bulbs are 140, 125, 135, 141, 135, 142 and 123 days.
b. The lifetime of type B bulbs are 135, 125, 145, 122 and 139 days.
Which type of light bulb has a longer lifetime? Why?