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# Grouped Data Tables

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by

## Mr Mattock

on 2 February 2018

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#### Transcript of Grouped Data Tables

Grouped Data Tables
Starter
Interpreting grouped tables
Main Activity 1
L.O. - Understand data in a grouped table, and apply ideas of mode to grouped tables.
(a) Would someone
who weighs 60 Kg go into the second or third group?

(b) How many people were weighed?

(c) How many people are 70kg or less?
Starter
(a) Would someone
who weighs 60 Kg go into the second or third group?
Second

(b) What is the maximum weight that can be represented in this table?
90

(c) What is the minimum weight that can be represented?
Weights above 40kg
(a) Work out an estimate for the number of people above 75 kg.

(b) Work out an estimate of the number of people below 55 kg.

(c) Work out an estimate of the total weight of all of the people.
Interpreting grouped tables
(a) How many people
are below 60 Kg?
17
(b) How many people
do you think are below
75 Kg?
41
(c) Estimate how many people are above 57 Kg.
35
How many weeks
are there in the season?
In how many weeks were there less than 20 yellow cards?
In how many weeks were there more than 24 yellow cards?
Main Activity 1
How many weeks
are there in the season?
40
In how many weeks were there less than 20 yellow cards?
28
Estimate in how many weeks there were more than 27 cards.
3
Mode and Grouped Data
Why cant we give a mode here?
What can we say about what weight most people are?
Mode and Grouped Data
Why cant we give a mode here?
Don't know exact weights.
What can we say about what weight most people are?
Can say most are in the range 60 < w < 70.
The modal class is 60 < w < 70
Main Activity 2
Write down the modal class of this data.

What does this mean?
Main Activity 2
Write down the modal class of this data.
10 - 14

What does this mean?
That more weeks saw 10-14 cards than any other group (not "In most weeks there were 10-14 cards").

Starter
Complete the comparison as given on your sheet.

You may use a calculator if you wish.
Starter
Wednesday: Mean = 7.25 Range = 4

Saturday: Mean = 6.62 Range = 3

The purchasers on Wednesday had a higher average shoe size, with 7.25 compared to 6.62.

However on Saturday the shoe sizes purchased were more consistent.
Key
Examples

Activities
Activity

Worked
Example

Worked
Example

Worked
Example

Main Activity 1
Work out an estimate for the number of weeks with less than 12 yellow cards.
Work out an estimate for the number of weeks with more than 27 yellow cards.
Work out an estimate of the total number of yellow cards given.
Full transcript