Question 843074
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Hi,
mean 24min, sd = 3.8
Using TI Calculator
a. What is the probability that a trip will take at least ½ hour(30mim)?  
normalcdf(smaller, larger, µ, &#963;)= normalcdf(30, 9999, 24, 3.8).
Note: The 9999 is used as the larger value to be at least 5 standard deviations from the mean.
 b. Find the probability that 2 of the next 3 trips will take at least ½ hour.
 binompdf(n, p, x-value)=  binompdf(3, p, 2).
 c. What is the probability that a trip will take 20 to 23 minutes?
normalcdf(smaller, larger, µ, &#963;)= normalcdf(20, 23, 24,3.8).