Probability...?! (10 points, and a good rating)?

Question

-What is the probability of winning a raffle if 500 tickets are sold and you buy 5 of them?

-A class of 25 students has 15 girls & 10 boys. One person is chosen randomly, what is the probability that its a girl?

-A regular card deck cotains 52 cards, 4 of which are aces.Assuming the cards are delt randomly, what is the Probability that the first card delt will be an ace?

-You roll a pair of dice. What is the theoretical probability of the sum that occurs the most?

Answer 1

1/100

3/5

1/13

1/6

Answer 2

1 in 100 u will win raffle

3 in 5 chances a girl will be chosen

1 in 13 an ace will be delt

7 occurs the most because the most numbers will make seven

all ratios are in lowest form

Answer 3

-5/500= 1/100= 1%chance.

-15/25=3/5=60% chance.

- 4/52= 1/13, or about a 7.5% chance.

-there's 36 possibilities, all shown below(if you add 1+5=6, that's including all possibilities, the '1' is just basically a tally.)

1+1

1+2 : 1

1+3: 11

1+4: 111

1+5:1 111

1+6: 11111

2+6: 11111

3+6: 1111

4+6:111

5+6: 11

6+6: 1

There are two theoretical sums that will come up the most, 7 and 8.

and they're both 6/36, or 1/6= 16% Chance of them coming up(either a 7 or 8)