Algebra I Chapter 11 Test Probability and Statistics

The mode score on the 6th grade math test was 94! Which of these interpretations must be correct?

• 99 was the highest score on the test.

• More students received a 94 than any other score

• No student scored below a 50

• A score of 91 was slightly below average.

How do you find the mean of a data set?

• Add the data and divide the sum by the number of data.

• List in order from least to greatest

• Add the numbers and subtract the largest number

• Find the number that ocurrs most often in the data.

The salary of the employees in the office were $15,000; $18,000; $16,000; $14,000; $90,000; and $17,000.  What is the best measure of the central tendency of the salaries?

• Mean

• Median

• Mode

• Range

How do you find the median of a set of data?

• Put the numbers in order from least to greatest and find the middle number.

• Add all of the data together and then divide the sum by the number of data.

• Find the number that ocurrs most often in the data.

• Subtract the largest and smallest

Match the following terms with their definitions

• Middle of the data set. Half the data (50%) lies below this value and half (50%) lies above.

• First Quartile (Q1)

• Middle of the lower half of the data set. 25% of the data lies below this value and 75% lies above.

• Third Quartile (Q3)

• The highest value of the data set

• Maximum (Max)

• The lowest value of the data set

• Minimum (Min)

• Middle of the upper half of the data set. 75% of the data lies below this value and 25% lies below.

• Median (Q2)

What is the median of the data?

Mathematical Equivalence

ON

What data value is the upper quartile (Q3)?

Mathematical Equivalence

ON

What is the value of the Lower Quartile? (Q1)

Mathematical Equivalence

ON

What is the interquartile range (IQR)?

Mathematical Equivalence

ON

What percent of students have a height between 58 inches and 60 inches?

Record as a decimal.

Mathematical Equivalence

ON