If we manipulate the equation and make k the subject we get 1.2 which is the answer.
If we manipulate the equation and make t the subject we get 0.56 which is the answer.
If we manipulate the equation and make z the subject we get 63.36 which is the answer.
If we manipulate the equation and make x the subject we get 1.2 which is the answer.
If we manipulate the equation and make x the subject we get -0.831 which is the answer.
If we manipulate the equation and make x the subject we get 0.706 which is the answer.
1 is neither prime nor composite
Total number of bulbs tested, N = 445
Number of bulbs that lasted more than 500 hrs, x = 316
Point estimate of bulbs that lasted more than 500 hrs = x/N = 316/445 ≈ 0.71 = 0.71*100 = 71%
