Out of 3000 light bulbs that were tested, 126 were defective. find the prbability of defective and non defective

P(defective) = 126/3000 = 0.042

P(not defective) = 1 - P(defective)

= 1 - 0.042 = 0.958

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )