Question

40% of lightbulb produced by shining beauty company have suboptimal performance. 5 bulbs are chosen for test. find the probability that 2 bulbs or less have suboptimal perfor-mance. (b) 40% of lightbulb produced by shining beauty company have suboptimal performance. 500 bulbs are chosen for test. compute approximately the probability that 210 bulbs or less have suboptimal performance. (c) 0.4% of lightbulb produced by light company have suboptimal performance. 500 bulbs are chosen for test. compute approximately the probability that 2 bulbs or less have subopti-mal performance

Answer 1

(a) about 68.3%

(b) about 83.1%

(c) about 67.7%