MEAN
How do you calculate the mean
How do you calculate the mode
The mode is the value that appears most frequently in a data set. A set of data may have one mode, more than one mode, or no mode at all.
How do you find the median
To find the median, first order your data. Then determine the middle position based on the number of values in your data set.
What is the formula for Percentile Rank? AND what does each variable mean?
PR = (b/n) x 100
b= number of values below the one being considered
n= total number of values in the data set
Which is normally a more accurate representation of data?: The trimmed mean, or the arithmetic mean?
Trimmed mean (Because it removes the outliers)
What is the mean of the numbers
20, 25, 10, 35, 30
24
What is the mode of the numbers:
2, 4, 7, 3, 4, 7, 2, 4
4
What is the median
5, 3, 4, 7, 8, 5
3, 4, 5, 5, 7, 8
5+5 = 10
10/2 = 5
5
Find the percentile rank if:
b = 10
n = 35
29th percentile (28.57 - need to round up!)
What is a weighted mean? AND give an example for when we would use a weighted mean in real life.
The mean calculated when certain values are worth more than others.
Ex) when calculating grades, assignments are worth less than tests, and final exam
What is the mean of these numbers
10, 20, 30, 40
25
What is the mode:
56, 45, 76, 99, 56, 76, 32, 56
56
What is the median:
24, 56, 35, 22, 2, 6, 5
22
Find the missing value b if:
PR = 67
n = 200
b = 134
Describe what a Percentile Rank is (not the formula)
Indicates the percentage of values of the given data that are lower than the given number
What is the trimmed mean?
Calculating the mean when you remove both outliers (highest and lowest values)
What is the mode:
65, 45, 35, 54, 45, 54, 30
45 and 54
What is the median:
10, 30, 80, 34, 67, 72, 65
65
There are 120 students in grade 10 at SAB. They took a math exam. Of the 120 students, 16 earned a lower mark than Henry. What was his percentile rank?
PR = 13th percentile
How do you calculate the range of a data set?
Take the highest value subtract the lowest value.
Weighted Mean - Calculate Sarah's total grade for her math course if she:
Scored 85% on assignment worth 10%
Scored 72% & 65% on quizzes each worth 20%
Scored 90% on final exam worth 50%
8.5 + 14.4 + 13 + 45 = 80.9% = 81%
What is the mode:
34, 56, 78, 23, 33, 10, 90
None
What is the median:
23, 49, 87, 75, 88, 59, 89 is
75
There are 120 students in grade 10 at SAB. They took a math exam. Of the 120 students, 2 earned the same mark as Kelly, and 45 earned a higher mark than Kelly. What was Kelly's percentile rank?
b = 120 - 2 - 45 - 1 = 72
PR = 60th percentile
Students say we do not need math for real life, is this true or false
False -
Math Matters in Everyday Life for: