Question 1173092
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Hi  
The time that it takes for the next train to come follows a Uniform distribution with f(x) =1/40 where x goes between 3 and 43 minutes.
Uniform Distribution a = 3 and b= 40
{{{f(x) = 1/(b-a) = 1/40}}}, {{{mu = (a+b)/2 }}} and  {{{ alpha = sqrt((b-c)/12)}}}
Uniform and Continuous
c) μ = (46)/2 = 23
d) σ = sqrt((40)^2/12) 
e) P(x < 39) = (39-3)/40
f) ( 5 < x <23) = (23 - 5)(1/40)  
g.)P(x < k) = (k-3)(1/40) = .15 , k = 3 + 40(.15)
h.) NEW f(x):   {{{f(x) = 1/(43-15) = 1/28}}}
P(x> 36) = (43-36)(1/28)
Wish You the Best in your Studies.