Mean, Median, and Mode
Consider the list of values:
42, 57, 38, 41, 50, 56, 32, 42, 53, 51, 38, 51, 56, 37
What is the mode?
42, 51, and 56
What is the main difference between bar graphs and histograms?
The bars of a histogram will touch.
List the 5 parts of the 5 Number Summary.
Minimum
Quartile 1
Median/Quartile 2
Quartile 3
Maximum
What is the smallest possible standard deviation?
0
Amelia packed 6 shirts, 5 pants, and 4 pairs of shoes for vacation. How many outfit combinations can she wear?
120 outfits
Consider the list of values:
42, 57, 38, 41, 50, 56, 32, 42, 53, 51, 38, 51, 56, 37
Calculate the mean.
46
Consider the following information:
[28, 34) frequency of 2
[34,38) frequency of 4
[38,44) frequency of 7
Is the data left or right skewed?
Left skewed
Consider the list of numbers:
14, 3, 17, 22, 5, 28, 9,
Calculate the inter-quartile range.
IQR = 17
For step 2 of calculating standard deviation, you have to construct a 3-column table. What are the labels for each column?
x, x-mean, (x-mean)2
A person flips a coin and rolls a six-sided dice. What is the probability that they get Tails and roll a number greater than 2?
4/12 or 33%
Consider the list of values:
42, 57, 38, 41, 50, 56, 32, 42, 53, 51, 38, 51, 56, 37
Identify the median.
46
Students exam scores are listed below.
[70, 80) frequency of 18
[80,90) frequency of 11
[90,100) frequency of 3
What percentage of students scored a B or higher?
44%
Consider the list of numbers:
14, 3, 17, 22, 5, 28, 9, 24, 12, 10, 7
Find the 5 Number Summary values for this data set.
min=3, max-28, median=12, q1=7, and q3=22
The values in the (x-mean)2 column of a table are: 0.09, 10.89, 13.69, 2.89, 75.69, 53.69, 22.09
Calculate the sample variance.
22.4
Which of the following are NOT mutually exclusive events?
a) wearing a hat, wearing sunglasses
b) pulling a 10 from a card deck, pulling a number greater than 2
c) rolling a 5 on a dice, rolling an even number
d) a and b are both correct
e) a and c are both corrrect
d) a and b are both correct
Elementary school students were surveyed about how many hours of sleep they typically get. 85 students slept for 8 hours, 55 students slept for 9, and 20 students slept for 10 hours.
Calculate the weighted mean.
50.9
Consider the following test scores:
79, 64, 71, 85, 89, 90, 76, 82, 68
What would be the intervals if you were to make a frequency distribution table?
[64,73)
[73,82)
[82,91)
Consider the list of values:
22, 29, 34, 28, 30, 36, 49, 32, 20, 31, 29
Determine the upper and lower fences. Are there any outliers?
Lower fence= 22
upper fence=38
49 is an outlier
Consider the following data: 25, 62, 32, 38, 63, 75, 46
Calculate the standard deviation.
13.8
56200 students were surveyed about what kind of pets they have. 49% said they own a dog, 41% own a cat, and 28% own both.
Find the probability that a student owns a dog, given that they own a cat.
56/82=68%