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# Calculator displays

By Sandra Cooper,2014-04-13 21:10
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Calculator displays

Median B4 The table below shows the number of taxis per week between

two towns over 13 weeks. Find the median number of taxis.

A: What is the Median ? Number of taxis 11 12 13 14

Number of weeks 2 4 6 1

B5 A biologist is comparing the length of the stalks of a sample

of 20 mushrooms.

The table below shows his results.

Find the median stalk length.

Stalk Length (mm) 18 19 20 21 22 23

Number of Mushrooms 1 1 3 5 7 3 The median person B6 The table below shows the scores in a mathematics test.

Seven workers stand in a line. Score 0 1 2 3 4 5 6 7

They are arranged so that everyone is in order of height. Number of Students 2 3 6 5 3 4 8 4

The tallest person should be at the front and the shortest at the back. Find the median score.

Who is in the middle ?

B7 The table below shows the ages of all of the people in a certain That person has the average height for that group. mathematics class.

We say that they have the median height. Age 11 12 14 17 42 Number of people 9 16 3 1 1 Example

Find the median age. The weights of 7 shopping bags are listed below. Find the median weight. 1; 2kg, 0;8kg, 1;05kg, 1;4kg, 0;95kg, 1;15kg, 0;75kg. Solution

First we write the weights in order.

0;75kg, 0;8kg, 0;95kg, 1;05kg, 1;15kg, 1;2kg, 1;4kg

Next, we choose the middle one. 0;75kg, 0;8kg, 0;95kg, 1;05kg, 1;15kg, 1;2kg, 1;4kg

The median weight is 1;05kg. ? Deptford Green School 1998

B Harder Median Examples

Example

A1 Measure the lengths of the pencils in the picture below.

Which pencil has the median length ?

(a)(b)(c)(d)(e)(f)(g)

A2 (a) Write these numbers in order:

6, 9, 2, 11, 3, 8, 1, 4

(b) Which number is the median ?

A3 (a) Write these numbers in order:

23, 13, 38, 56, 42, 21, 52, 71, 19

(b) Which number is the median ?

A4 (a) Write these numbers in order:

0;3, 1;3, 0;7, 2;1, 1;7, 5;4, 1;8

(b) Which number is the median ?

A5 Copy and complete:

To find the median of a list of numbers first you ……..

Then you choose the ……….

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