Word Problems
A box contains 5 nickles and 5 quarters
a) What is the chance of picking a nickle? Change into percentage
b) Which is more likely: picking a nickle or picking a quarter?
a) P(Picking a nickle)=5/10 = 50%
b) Picking a nickle or a quarter
Hansel rolled 2 6-sided dice. What is the probability of getting a number smaller than 10?
P(getting a number smaller than 10)= 9/12=3/4
James rolls a 6-sided die. What is the probability that James will roll a 5?
P(rolling a 5)=5/6
In a box there are 20 black balls, 13 grey balls, and 7 white balls. Marcel randomly picks a ball.
What is the probability of choosing a,
a) Black ball,(percentage)
b) White ball,
c) Black or Grey ball,
a) P(Black balls)=20/40 = 2/4 x 25 = 50/100 = 50%
b) P(White balls)=7/40
c)P(Black or Grey balls)=20/40 + 13/40= 33/40
Alex tosses two dimes in the air. What is the probability that both dimes will land on heads.
P(getting 2 heads)= 2/4=1/2
A jar contains 7 blue marbles, 3 red marbles, and 3 green marbles, Joanna randomly picks a marble without looking. What is the probability of choosing either a red or a green marble?
P(choosing a red or green marble)=3/13+3/13=6/13
Jose rolled a die one time. Find the probability of getting a number higher than 4.
P(Getting a # greater than 4)= 2/6=1/3
I spin a spinner 50 times. It lands on A 8 times, B 17, C 9, D 6, and E 10 times. What is P( getting an A)?(percentage)
Alice rolls a nineteen sided die(with numbers 1-19). What is the probability of rolling a multiple of 3?
P(rolling a multiple of 3)= 6/19
A 10 sided die numbered 0-9 is rolled. Find the P(more than 1).
P(more than 1)= 8/10= 4/5
A bag contains 4 blue, 6 pink, and 2 white marbles. You draw a marble at random. What is P(pink)?
P(Pink)= 6/12= 1/2
A dog trainer was taking care of 3 beagles, 4 hounds, and 3 huskies. What is the probability of the hounds playing with four balls?(percentage)
P(hounds playing with the balls)=4/10=40%
Rachel has 2 dice. If both dice are rolled one time, find the probability of getting a sum greater than 9.(percentage)
P(a sum greater than 9)= 3/12= 1/4 x 25= 25%
A letter card A through H is chosen, and a number cube (die) is rolled. Find the probability of each event. P(B and even)
P(B and even)= 1/8+3/6= 4/24= 1/6
Janice has three $20 bills, two $50 bills, and five $10 bills. She mixes them up in a box. What is the probability of getting $20 bills or $50 bills? (percentage)
P(getting $20 or $50)= 3/10+2/10=5/10= 50%