Una
It is the average of a data set.
Mean
It is usually described as the ‘middle number'.
Median
It is the most common number that appears in your set of data.
Mode
Find the Median: 5, 6, 4, 5, 8, 9, 7
6
Find the average of these data: 21, 18, 19, 16, 12, 10
16
These are the three points which divide the given set of data into four equal parts.
Quartiles
It is the collection of observations produced by sorting them into classes and showing the frequency of occurrences in each class.
Frequency Distribution Table
What is the first step in determining the measure of position of ungrouped data?
Arrange the given
What decile position is equivalent to the median?
D5
Arrange the data into increasing order: 14, 17, 10, 22, 19, 24, 8, 12 and 19
8, 10, 12, 14, 17, 19, 19, 22, 24
The following are Mark’s scores in his Mah Quizzes: 15, 9, 8, 10, 21, 15, 20, 14, 18. What is the mode?
15
Which of the following statements is correct?
A. The median score of the ungrouped data is equal to 3rd decile.
B. The 5th decile has the same value as the 50th percentile.
C. The mean is the repetition of scores in a set of data.
D. The percentile rank is the same as a percentage.
B. The 5th decile has the same value as the 50th percentile.
What quartile is equivalent to P75?
Q3
Write the formula for Percentile of ungroup data.
See on the board
How can we compute the Lower Boundaries?
By subtracting 0.5 from the Lower Limits of the given Frequency distribution table.
These are facts and statistics collected together for reference or analysis.
Data
Find the percentile rank of 14 of the given set of scores:
9, 9, 10, 11, 12, 12, 14, 18, 19, 20
60
What is <cf?
It is the cumulative frequency less than the cumulative frequency in a certain class.
In a race, winners are based on less time to finish the tracks compared to everyone else. In which measure of position must a cyclist’s time belong to win the race?
1st Decile or 10th Percentile
In a Math test, 75% of the class got scores below 55. Which of the following is true about the score 55?
A. It is the 75th percentile
B. It is above the 9th decile.
C. It is the median
D. It is below the first quartile
A. It is the 75th percentile
The method of describing the position of a data point relative to the rest of the dataset. It also allows comparison and understanding of data distribution.
Measures of Position
These are the practice or science of collecting and analyzing numerical data in large quantities.
Statistics
Alex is a secretary in a big company in Pasig City. His salary is in the 7th decile. Which of the following describes his salary?
A. His salary belongs to the upper quartile.
B. His salary is greater than or equal to the eightieth percentile.
C. His salary is less than or equal to the second quartile.
D. His salary is less than or equal to the seventh decile.
D. His salary is less than or equal to the seventh decile.
The 4th decile of the ages of 1450 Grade 10 students is 16 years old. Which of the following statements is true?
A. Most of the students are below 16 years old.
B. 60 percent of the students are 16 years old and above.
C. 40 percent of the students are 16 years old and below.
D. 580 students are younger than 16 years old.
C. 40 percent of the students are 16 years old and below.
In a 50-item test, assuming that 75th percentile is the passing mark. This means that the student must answer _____________.
A. at least 39 items correctly to pass the test
B. at most 39 items correctly to pass the test
C. at least 37 items correctly to pass the test
D. at most 37 items correctly to pass the test
A. at least 39 items correctly to pass the test