7 is the right answer(please rate 5.0 stars so i can help other people out thanks)
Expected value of the bet is
the sum of the products of value of outcome and its probability,
less the amount paid to place the bet.
Outcomes value probability
win 225 1/4
lose 0 3/4
cost of bet = 40
So expected value of bet
E[X]=225*(1/4)+0*(3/4)-40
=56.25-40
=16.25
This means that in the long run, gambler will win, since the expected value is positive. (does NOT mean she will win in the next bet!)
So it would be 3s + 7s + 11s + 15s + 19s + 23s + 27s. Hope this helps
a square number has and odd amount of numbers but 5to the power of 9 has an even amount of numbers
5×5×5×5×5×5×5×5×5
14-10=? less than indicates that a minus sign is needed.
