Vocabulary
how do you find the mean?
add all the numbers and divide by how many there are
What is the range of the data set below?
51, 54, 56, 48, 67, 59, 61, 63, 64
67 - 48 = 19
how do you find the mode?
look for the most often occurred number
Find missing value using the information below.
13, 16, 17, 4, 7, 3, 17
Is the range or the mode the greatest number?
Range: 17-3=14
Mode: 17
how do you find the median?
looking for the middle number
Haley wants to bring up her grade in biology. She got a 5, 87, 79, 65, 65, and a 92 on the first three quizzes. Is the range or the mode the greatest?
Range: 92-5=87
Mode: 65
how do you find the range?
by taking the difference of the biggest and smallest number
At a small company, the following are the monthly salaries (in thousands of dollars) for 7 employees:
$2k, $2.5k, $3k, $3.5k, $4k, $6k, $20k.
Is the median lower or higher than the mean?
Median: Since there are 7 values, the median is the 4th value: $3.5k
Mean:
Total = 2 + 2.5 + 3 + 3.5 + 4 + 6 +20= 41k
Mean = 41 ÷ 7 = $5.86k
LOWER
what do you need to be able to use the measures of center?
data-numbers!!
A group of 9 students recorded the number of books they each read over the summer:
1, 2, 2, 3, 4, 5, 6, 7, 20
Is the range higher or lower than the median?
Range: Highest value − Lowest value = 20 − 1= 19
Median: The middle value (5th out of 9) = 4
HIGHER