Measures of Center
Measures of Variability
Probability: Simple Events
Theoretical vs Experimental
Probability: Compound Events
7th Grade Math Review
100
What is another word for mean?
Average
100
List 2 of the measures of variability we talked about this chapter.
Possible answers: range, IQR, outliers, mean absolute deviation
100
Find P(heads) when flipping one coin.
P(heads) = 1/2 or 50%
100
What is theoretical probability?
What you would expect to occur; what should occur if you conduct a probability experiment.
100
A coin is flipped 4 times. How many outcomes are there?
16
100
What is a decimal equivalent of the fraction 8/15
0.53333333333.....
200
What is the mode?
The data value that occurs most frequently.
200
How do we find the range?
Largest value - smallest value
200
The probability of rolling a 5 on a 20-sided die is 5%. Is this outcome impossible, unlikely, 50-50, likely, or certain?
Unlikely
200
What is experimental probability?
What actually occurs during a probability experiment.
200
A coin is flipped twice, and a number cube is rolled twice. How many possible outcomes are there?
144
200
Bonnie deposits $70 into a new savings account.
- The account earns 4.5% simple interest per year
- No money is added or removed from the savings account for 3 years
What is the total amount of money in her savings account at the end of the 3 years?
$79.45
300
When do we use mean when comparing two populations?
When they are BOTH symmetric.
300
Find the range of this data set.
2 5 2 1 4 5 7 4 2 2 1
range = 6
300
Find P(3 or 4) when rolling a standard 6-sided number cube.
P(3 or 4) = 1/3 or "about"" "33.3%
300
What happens as we do more and more trials in a probability experiment?
The experimental probability gets closer and closer to the theoretical probability.
300
A coin is flipped 4 times. What is the probability of flipping 4 heads in a row?
P(headstimes4)=1/16 or 6.25%
300
Three classes at a junior high school raised money to buy new computers.
- Ms. Moore's class raised $249
- Ms. A's class raised $396.63 more than Ms. Moore's Class
- Mr B's class raised $430.43 less than Ms. A class
What is the total amount of money raised by all three classes?
$1109.81
400
Find the mean of this data set:
1 1 2 3 4 4 4 5
mean = 3
400
Find the IQR of this data set.
2 5 2 1 4 5 7 4 2 2 1
IQR = 3
400
Find P(ace) when drawing a card from a standard deck of cards.
P(ace) = 1/13 or 7.7%
400
Out of a similar group of 425 visitors to a science museum, predict how many would choose the planetarium as their favorite exhibit.
We would expect about 68 people to say the planetarium is their favorite.
400
A coin is flipped, a 20-sided die is rolled, a card is picked at random out of a standard deck (52 Cards), and a random letter of the alphabet is chosen (26 Cards). How many outcomes are there?
54,080
400
What number can go in the black to make the equation true?
- 4.5 + 4.4 + _____ = 0
0.1
500
Find the median of this data set.
2 5 2 1 4 5 7 4 2 2 1
median = 3
500
Find the mean absolute deviation of this data set. Round to the nearest tenth if necessary.
2 5 2 1 4 5 7 4 2 2 1
M.A.D. ≈ 1.8
500
In the RAMS ticket drawing, 35 tickets are from PB's 1st hour, 103 tickets are from PB's 2nd hour, 201 tickets are from PB's 5th hour, and 358 tickets are from PB's 3rd hour. If Nick submitted 55 tickets, what is the probability his name gets picked?
P(Nick) = 55/697 or 7.9%
500
Based on the table, if you choose an adult at random, what would be the probability that they would prefer to pay bills online?
P("online")=9/40 or 22.5%
500
A coin is flipped, a 20-sided die is rolled, a card is picked at random out of a standard deck (52 Cards), and a random letter of the alphabet is chosen ( 26 Letters). What is the probability of flipping a heads, rolling a 12, choosing a 3 of spades, and choosing the letter j?
P("...that") = 1/54080 or ~~ 0.002%
500
Nick is making bread dough.
- The recipe requires 3/4 cup of flour and 1 1/8 teaspoons of salk
- Nick wants to make the recipe using 1 cup of flour.
To maintain the ratio, How much salk is required when 1 cup of flour is used?
1.5 teaspoons of salt