Question 1010468: The life expectancy of a typical lightbulb is normally distributed with a mean of 1,975 hours and a standard deviation of 25 hours. What is the probability that a lightbulb will last between 1,950 and 2,050 hours? (5 points)
0.84
0.77
0.82
0.89
Answer by keremtuncer(1)   (Show Source):
You can put this solution on YOUR website! Hey mate, for this one you would need to use a normal calculation. I hope you have a graphing calculator, If you dog to distributions and then to normalcdf, plug in 1975 as mean, 25 as sd, lower boundary as 1950 and upper boundary as 2050 and get the answer 0.839995 Now just round it and get your answer !
Hope I helped !
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