MATHEMATICS · Single correct · GCSE · Mathematics · Probability · Probability
Problem
In an experiment, an event occurred 15 times in 40 trials. The experimenter plans to conduct 10 more trials. What is the minimum number of additional successes needed so that the empirical probability of the event becomes at least 0.45?
(a) 9
(b) 8
(c) 6
(d) 7