The mean is the average of the number of discs sold.
So we need to sum up all of the CD's sold and then divide by 6, since
there are 6 days:
We need to list the numbers in numeric order:
10, 10, 10, 15, 15, 18
If we pick 10 (the third one) for our median we have two values below it and three above it. If we pick 15 (the first one) for our median then we have three values below it and two above it. So neither of those values are the median. This does not mean we don't have a median.
Note how there is an even number of values listed. If that
is the case, we need to draw a line down the middle of the list and take
the mean of the two numbers next to that line.
10, 10, 10 | 15, 15, 18
The mean of 10 and 15 is
It helps to list the numbers in order to find the mode.
10, 10, 10,
15, 15, 18
Note how 10 occurs three times, which is the value that occurs the most.
10 is the mode.
Keep in mind that the test score counts twice instead of of time.
So when we set this up we need to make sure that we notate that properly.
*Solve for x (missing test)
*Inverse of div. by 5 is mult. by 5
*Inverse of add 246 is sub. 246
Let's find the range. What do you think it is?
Looking at the difference between the largest value, which is 21 and the smallest value, which is 0, it looks like the range is 21.
Now lets tackle the standard deviation.
*Add numerator
*Divide by 8
Step 2: Find the difference between the mean and each
separate value of the data set,
AND
Step 3: Square each difference found in step 2,
AND
Step 4: Add up all of the squared values found in
step 3.
x x - 13 0 -13 169 7 -6 36 7 -6 36 14 1 1 17 4 16 17 4 16 21 8 64 21 8 64 SUM: 402
Find the mean of the frequency distribution.
*calculate numerator
*divide
Last revised on August 7, 2011 by Kim Seward.
All contents copyright (C) 2001 - 2011, WTAMU and Kim Seward.
All rights reserved.