Simon's copy of Julie's copy of Mean from a frequency table - classes

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Simon Thomas 6 years, 1 month ago

Created this as a copy of Julie's copy of Mean from a frequency table - classes.

Name	Status	Author	Last Modified
Julie's copy of Mean from a frequency table	draft	Julie Crowley	08/10/2016 20:34
Julie's copy of Mean from a frequency table - classes	draft	Julie Crowley	08/10/2016 20:34
Mean, median and mode from a frequency table with classes 1	draft	Julie Crowley	06/03/2017 15:00
Mean, median and mode from a frequency table with classes 2	draft	Julie Crowley	06/03/2017 15:00
Mean, median and mode from a frequency table with classes 2b	draft	Julie Crowley	06/03/2017 15:01
Mean, median and mode from a frequency table with classes 1(b)	draft	Julie Crowley	16/04/2018 18:01
Mean, median and mode from a frequency table with classes 2c	draft	Julie Crowley	06/03/2017 15:04
Mean, median and mode from a frequency table with classes 1c	draft	Julie Crowley	07/03/2017 14:49
Catherine's copy of Mean, median and mode from a frequency table with classes 2c	draft	Catherine Palmer	02/03/2018 14:45
Catherine's copy of Mean, median and mode from a frequency table with classes 1c	draft	Catherine Palmer	02/03/2018 14:47
Mean and median from a frequency table with classes 1(b)	draft	Julie Crowley	25/04/2018 18:41
Mean and mode from a frequency table with classes 1c	draft	Julie Crowley	25/04/2018 18:42
Mean and standard deviation from a frequency table with classes 1c	draft	Julie Crowley	25/04/2018 18:43
Michael's copy of Mean and standard deviation from a frequency table with classes 1c	draft	Michael Proudman	07/12/2021 09:49
Simon's copy of Julie's copy of Mean from a frequency table	draft	Simon Thomas	27/03/2019 09:32
Simon's copy of Julie's copy of Mean from a frequency table - classes	draft	Simon Thomas	27/03/2019 09:40

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Question statement

In CITech Ltd there was a special fundraising drive among staff for ebola affected regions of Africa. A sister of one of the staff is an aid worker in Africa. The frequency table below describes the amount in euro donated by individual staff. Calculate the mean for the data.

Give any introductory information the student needs.

			Name	Type	Generated Value

a	integer	0
c	integer	5
b	integer	3
d	integer	5
f	integer	7
q	integer	30
p	integer	40
s	integer	50
r	integer	60
t	integer	70
stdev	decimal	dec("1.077032961426900806250142098308065911259e+1")
Answer	rational	58
x	integer	20
Total	integer	1160
data	list	Nested 5×2 list

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(0..3)

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

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Generated value: `integer`

→ Used by:

Total
data
f
stdev

This variable doesn't seem to be used anywhere.

Parts

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1. Gap Number entry
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Class ( in euro)	frequency
{q-5} but less than {q+5}	{a}
{p-5} but less than {p+5}	{b}
{s-5} but less than {s+5}	{c}
{r-5} but less than {r+5}	{d}
{t-5} but less than {t+5}	{f}

Mean: Unnamed gapeuro (correct to 2 decimal places)

Advice

To find the mean use the formula $\frac{\Sigma fx}{\Sigma f}$

In this question, we have intervals rather than exact values for $x$ (e.g. the first interval is " $\var{q-5}$ but less than $\var{q+5}$ ")

So when calculating ${\Sigma fx}$ we are going to use the midpoint of each interval as our values of $x$ (e.g. the first interval we will use $\frac{\var{q-5}+\var{q+5}}{2} = \var{q}$ )

Hence:

$\Sigma fx= (\var{a} \times \var{q}) + (\var{b} \times \var{p}) +( \var{c} \times \var{s}) + (\var{d} \times \var{r}) + (\var{f} \times \var {t}) = \var{Total}$

mean $=\frac{\Sigma fx}{\Sigma f}= \var{Total} \div 20 =\var{Answer}$

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Simon's copy of Julie's copy of Mean from a frequency table - classes

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Taxonomy: mathcentre

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Simon Thomas 6 years, 1 month ago

Error in variable testing condition

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Generated value: `integer`

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Simon's copy of Julie's copy of Mean from a frequency table - classes

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

History

Comment

Checkpoint description

Simon Thomas 6 years, 1 month ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Gap-fill

Generated value: `integer`