The mean time to get an oil change done at Leakys Garage is

The mean time to get an oil change done at Leaky\'s Garage is 49 minutes, with a standard deviation of 11 minutes. Assuming a normal distribution, what is the probability that a randomly chosen customer experiences an oil change done between 49 and 71 minutes? 0.6826 0.5000 0.4772 0.3413

Solution

Mean=49

Standard deviation=11

For 49 minute, z=(49-49)/11=0

For 71 minute, z=(71-49)/11=22/11=2

By probality Table P(0<z<2)=0.4772 ans