Measures of Central Tendency
What are the five parts of a box-and-whisker plot?
lower extreme, upper extreme, lower quartile, upper quartile, and median.
In a recent survey, 4 out of 5 people chose Crest as their favorite toothpaste. What percent of the people in the survey chose Crest?
80%
A number from 1 to 12 is randomly chosen. What is the probability of selecting a number that is greater than 8 OR less than 3?
What is 1/2?
A box-and-whisker plot breaks your data down into ___ sections, each representing ___ % of your data.
4, 25
In a survey done last week about favorite Olympic sports, 32% of the people chose Curling. If the survey asked 500 people, how many people chose curling?
160 people
Compound probability where the outcome of the first event does not effect the outcome of the second event is called_____________________________.
What is Independent?
How do you find the median of a data set that has an even number of data points.
List the data in order from least to greatest. Take the two numbers in the middle and find the mean.
In a box-and-whisker plot, the Lower Extreme = 18, Upper Extreme= 42, Q2= 33, Q1= 24, an Q3= 38.
What percent of the data fall below 24?
25%
The numbers 1- 10 are your sample space. Find the P(choosing a 6)as a fraction and a percent.
1/10, 10%
A card is drawn from a deck of eleven cards with the letters PROBABILITY. What is the probability of drawing two cards, without replacing, of P(B and B)?
2/11 x 1/10 = 1/55
Find the mode of the following data set:
12, 13, 13, 15, 17, 19, 22, 22, 22, 24, 27, 29.
Mode= 22
Define Interquartile Range.
The interquartile range, or IQR, is the difference between the Upper and Lower quartiles in a data set. It shows the spread of the middle 50% of the data.
The table shows the results of rolling a die.
What is the experimental probability of rolling a 4?
1 - // 4 - ///
2 - / 5 - ///
3 - //// 6 - //
1/5
A card is drawn from a deck of eleven cards with the letters PROBABILITY. What is the probability of drawing two cards, with replacing, of P(vowel and I)?
4/11 x 2/11 = 8/121
Lauren analyzed some data from a survey about average time teens were allowed to spend on the internet on school nights. She found the mean to be 124 minutes, the median to be 121.5 minutes, and the mode to be 133 minutes. If Lauren is trying to convince her parents that she should be able to spend more time on the computer at night, which measure of central tendency should she use, and why?
She should use the mode, because that is the biggest number here. Lauren could legitimately say that "most" teens are allowed to spend 133 minutes per night on the computer.
The following set of temperatures recorded this weekend: 38, 45, 40, 33, 39, 50, 42, 40, 37.
This is the Upper Quartile.
What is 43.5?
What is the theoretical probability of rolling a 4 on a die?
1/6
A number from 1 to 20 is randomly chosen. The probability of selecting a number that is a multiple of 3 OR an even number
What is 13/20?