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20 questions
Calculate the mean and median for the data set: 6, 7, 12, 8, 7, 4, 8, 8, 7
mean: 7 median: 7
mean: 7.44 median: 8
mean: 7 median: 7.44
mean: 7.44 median: 7
What does the standard deviation tell us about the data set?
How spread out the numbers are
How much each number in the data set increases by
How much each number in the data set decreases by
If 160 people were surveyed, how many people were are least 60 inches tall?
40
80
100
120
Which of the following stats is incorrect?
70, 87, 93, 95, 82, 94
mean: 86.83
standard deviation: 8.78
IQR: 12
median: 94
The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.
About what percent of the products last between 9 and 18 days?
68%
34%
81.5%
13.5%
Fernando is 60 inches tall. The average height for his age and gender is 68 with a standard deviation of 10 inches. If the average height of males is normally distributed, what percent of his peers are shorter than him?
46.81%
8%
78.81%
21.19%
The ages of the population of people living in Meru area in Ipoh are normally distributed with mean 43 and standard deviation 14. If the population is 5,000, how many would you expect to be older than 57?
2,500
4,200
800
3,400
95% of test scores are between 74 and 92. Assuming this data is normally distributed, choose the correct mean and standard deviation.
mean: 83
mean: 85
standard deviation: 9
standard deviation: 4.5
68% of students at school weigh between 64 kg and 88 kg.
Assuming this data is normally distributed, what is the percentile of a student that weighs 82 kg?
75%
77.34%
22.63%
69.15%
A company makes parts for a machine. The lengths of the parts must be within certain limits or they will be rejected. A large number of parts were measured and the mean and standard deviation were calculated as 3.1 m and 0.005 m respectively.
Assuming this data is normally distributed and 99.7% of the parts were accepted, what are the limits?
Between 3.075 m and 3.125 m
Between 3.080 m and 3.120 m
Between 3.085 m and 3.115 m
Between 3.090 m and 3.110 m
Which of the following sets of data is likely to have the smallest standard deviation?
1, 2, 4, 6, 9, 12
3, 3, 3, 4, 4, 5
0, 5, 8, 12, 15, 22
not enough information
The number of text messages sent per day are as follows:
148, 148, 110, 84, 101, 122, 100, 90, 110, 118, 60, 104, 198, 142
Find the reasonable range and determine if there are any outliers.
79 - 164; outliers: 60, 198
58 - 188; outlier: 198
37 - 205 ; no outliers
62 - 200: outliers: 60
Which statement is FALSE?
A data value with a positive z-score is above the mean and the percentile is in the upper 50%.
A data value with a negative z-score is below the mean and the percentile is in the lower 50%.
A data value with a z-score of 0 is equal to the mean and the percentile is 0%.
A data value with a z-score of 0 is equal to the mean and the percentile is 50%.
A retirement community tracks the ages of its residents using this dot plot. What is the approximate standard deviation?
3.09 years
3.85 years
14.82 years
1.76 years
Using the frequency table, determine which statement is true.
The mean is larger than the median.
The median is larger than the mean.
The mean and median are the same.
Cannot be determined
The box plot below represents the number of absences, per student, over a semester by a group of seniors a local high School. Which of the following statements is TRUE?
the IQR is 10 days
the mean is 2 days
about 50% of students missed from 1 to 5 days
about 50% of students missed from 5 to 10 days
Select ALL the statements that are true.
50% of the people surveyed read between 40 and 55 minutes reading.
There are more people that read between 25 and 40 minutes than those that read between 50 and 55 minutes.
The median time spent reading is 50 minutes.
The range of the lower 50% is larger than the range of the upper 50%.
The reasonable range is between 17.5 and 81.5.
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