**Comparing mean and median worksheet :**

Worksheet on comparing mean and median is much useful to the students who would like to practice solving problems on measures of center.

**Problem 1 : **

The monthly earnings of several teenagers are $200, $320, $275, $250, $750, $350, and $310.

**Questions : **

(i) Find the mean. Round to the nearest tenth.

(ii) Write the data values in order from least to greatest and find the median.

(iii) What is the difference between the mean and the median ? Why ?

(iv) Which measure of center better describes the typical monthly earnings for this group of teenagers—the mean or the median ? Explain.

**Problem 2 : **

Luka’s final exam scores for this semester are 70, 72, 99, 72, and 69.

**Questions : **

(i) Find the mean.

(ii) Write the data values in order from least to greatest and find the median.

(iii) What is the difference between the mean and the median ? Why ?

(iv) Which is a better description of Luka’s typical exam score ? Explain your thinking.

**Problem 1 :**

The monthly earnings of several teenagers are $200, $320, $275, $250, $750, $350, and $310.

**Questions (i) : **

Find the mean. Round to the nearest tenth.

**Answer : **

Mean = (200 + 320 + 275 + 250 + 750 + 350 + 310) / 7

Mean = 2455 / 7

Mean = 350.7142........

Rounding to the nearest tenth

Mean = 350.7

**Questions (ii) : **

Write the data values in order from least to greatest and find the median.

**Answer : **

200, 250, 275, 310, 320, 350, 750

Number of observations (n) = 7

Median = [(n+1)/2] th value

Plug n = 7

Median = [(7+1)/2] th value

Median = 4 th value

Median = 310

**Questions (iii) : **

What is the difference between the mean and the median ? Why ?

**Answer : **

Difference between mean and median = |350.7 - 310|

Difference between mean and median = 40.7

**Reason : **

The mean is affected by the data value 750, which is much greater than the other data values. The median is not affected by this value.

**Questions (iv) : **

Which measure of center better describes the typical monthly earnings for this group of teenagers—the mean or the median? Explain.

**Answer : **

Median; The mean is greater than all but one of the data values. The median is a more central value.

**Problem 2 :**

Luka’s final exam scores for this semester are 70, 72, 99, 72, and 69.

**Questions (i) : **

Find the mean.

**Answer : **

Mean = (70 + 72 + 99 + 72 + 69) / 5

Mean = 382 / 5

Mean = 76.4

**Questions (ii) : **

Write the data values in order from least to greatest and find the median.

**Answer : **

69, 70, 72, 72, 99

Number of observations (n) = 5

Median = [(n+1)/2] th value

Plug n = 5

Median = [(5+1)/2] th value

Median = 3 rd value

Median = 72

**Questions (iii) : **

What is the difference between the mean and the median ? Why ?

**Answer : **

Difference between mean and median = |76.4 - 72|

Difference between mean and median = 4.4

**Reason : **

The mean is affected by the data value 99, which is much greater than the other data values. The median is not affected by this value.

**Questions (iv) : **

Which is a better description of Luka’s typical exam score? Explain your thinking.

**Answer : **

Median; the median is closer in value to most of the data values than the mean.

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