The life of a bulb is normal with mean 800 hours and standard deviation 40 hours. What is the probability that a bulb lasts more than 880 hours? (Take $P(0 < Z < 2) = 0.4772$ .)

0.0114

Correct answerYour answer

0.0228

Correct answerYour answer

0.4772

Correct answerYour answer

0.5228

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Worth noting

0.4772 is the chance of lasting between 800 and 880 hours.

Ten questions from Normal Distribution, at your own pace.

Ten questions from Normal Distribution, at your own pace.

The life of a bulb is normal with mean 800 hours and standard deviation 40 hours. What is the probability that a bulb lasts more than 880 hours? (Take P(0<Z<2)=0.4772P(0 < Z < 2) = 0.4772P(0<Z<2)=0.4772.)