The answer is A my dude, this is easy math lol
There would be 15 adults and 5 children in that group.
15 adults = $75
5 Children= $15
75+15= $90
Under 45 mins is roughly 16%. This is because 68% of the curve exists within 1 SD of the mean. So 16% must be outside and smaller and 16% outside and larger (on average).
It is impossible to determine how likely you are to find someone with exactly the second amount. However, if you are looking for that or less, you would get 84%
