Name: ______Date: ______Period: ______
Simple Probability
Theoretical Probability:
Thetheoretical probability of an event is written:
If the number cube shown is rolled once, write the following theoretical probabilities as fractions and reduce if possible?
1) P(1) = ______
2) P(5) = ______
3) P(3 or 4) = ______
4) P(Even) = ______
If the spinner shown is spun one time, write the following theoretical probabilities as fractions and decimals:
5) P(F) = ______= ______
6) P(A) = ______= ______
7) P ( A or F) = ______= ______
8) P(letter) = ______= ______
9) P(number) = ______= ______
10) Write the sample space as a list for the spinner above:
______
Below is another spinner. If the spinner is spun one time, find the following probabilities and write them as fractions.
11) P(X) = ______
12) P(letter) = ______
13) P(number) = ______
14) P(Z or 3) = ______
15) P(odd number) = ______
If the following marbles are placed into a bag and one marble is drawn out. Find the following probabilities and write them as a fraction, decimal, and percent.
16) P(Blue) = ______= ______= ______
17) P(Yellow) = ______= ______= ______
18) P(Red or Green) = ______= ______= ______
19) P(Not Red) = ______= ______= ______
20) Write the sample space as a list for the marbles above:
______
21) ______There are 45 balloons at a birthday party and only 15 of them have prizes inside. If a student
is allowed to pop one balloon, what is the probability she will not win a prize?
A)B)C) D)
22) ______The library has 500 books in the fiction section, 1000 in the reference section,
300 biographies, and 200 non-fiction. If selected randomly, what is the probability
of selecting a non-fiction
Experimental Probability
The experimental probability of an event is written:
23) How is experimental probability different fromtheoretical probability?
______
______
The table below shows the grade distribution for Ms. Green’s math classes. Use the table to answer questions 24-28.
Grade / Period 1 / Period 2 / Period 3 / Period 4A / 2 / 4 / 3 / 5
B / 4 / 5 / 3 / 4
C / 7 / 4 / 5 / 5
D / 5 / 1 / 2 / 1
F / 2 / 1 / 2 / 0
Total / 20 / 15 / 15 / 15
24) What is the experimental probability that a student in the first period will earn a B? ______
25) What is the experimental probability that a student in the third period will earn an A or F? ______
26) How many total students in all periods took the test? ______
27) How many total students in all periods failed the test? ______
28) When the results are all combined, what is the probability of a student failing the exam? ______
Hint: Use answers from questions 21 and 22 to answer question 23.
29) ______The probability of mighty Casey getting a hit is 40%. If he bats 2000 times, how many
times would you expect him not to get a hit?
30) ______A candy store owner discovers that 200 students prefer milk chocolate and 600
studentsprefer dark chocolate. What is the probability that the next student that comes
in the store will choose dark chocolate?
A) .75B) .333C) .25D) .5