Question 1173094
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Hi  
The times from when a person arrives at the busstop until the bus arrives follows a Uniform distribution from 0 to 7 
Uniform Distribution a - 0  and b= 7
{{{f(x) = 1/(b-a)}}}, {{{mu = (a+b)/2 }}} and  {{{ alpha = sqrt((b-a)/12)}}}
a) μ = (0 + 7)/2 = 7/2
b) σ = sqrt((7-0)^2/12)  = 2.02
c) P(x > 3mim) = (7-3)/7 = 4/7
d) Already waited 1min f(x) = {{{ 1/(7-1) = 1/6)}}}
P ( 2.1 < x < 3) = (3 - 2.1)(1/6) = .15
e.)P(x < k) = (k-0)(1/7) = .56
k =  .56/7 = .08 
Wish You the Best in your Studies.