Question
In: Statistics and Probability
The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 400...
The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 400 hours and a standard deviation of 10 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of the mean? Use the Empirical Rule and write your answer as a percent rounded to 2 decimal places.
Solutions
Expert Solution
solution
using empirical rule
P(
- 2
<
X <
+ 2)
= 95%
P(400 - 2 * 10 < X <400 + 2 * 10) = 95%
P(380 < X < 420) = 95%
Answer = 95%
orchestra answered 2 years agoRelated Solutions
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