Simon's copy of Cumulative frequency

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Simon Thomas 5 years, 11 months ago

Created this as a copy of Cumulative frequency .

Name	Status	Author	Last Modified
Cumulative frequency	Ready to use	Julie Crowley	07/10/2016 22:17
Cumulative frequency v3	draft	Julie Crowley	06/03/2017 15:52
etain's copy of Cumulative frequency	draft	etain kiely	17/01/2018 14:55
etain's copy of Cumulative frequency	draft	etain kiely	17/01/2018 14:55
Simon's copy of Cumulative frequency	draft	Simon Thomas	27/03/2019 10:37

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Question statement

The cumulative frequency diagram gives information about the time, in minutes, 50 people were kept waiting at hospital.

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(a)

How many people waited less than 20 minutes?

Looking at our cumulative frequency graph, we find 20 minutes on the x-axis. Then move vertically up until we reach the red cumulative frequency curve. Then move horizontally to the left to read of the value on the y-axis. The correct value is 10 people.

(b)

Give an estimate for the number of people who waited between 20 and 40 minutes.

As in part (a), we find 40 minutes on the x-axis. vertically up until we reach the red cumulative frequency curve. Then move horizontally to the left to read of the value on the y-axis. The corresponding value is approximately 33 people.

Since 10 people waited less than 20 minutes, and 33 people waited less than 40 minutes, that means 33-10 = 23 people waited between 20 and 40 minutes.

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Descriptive statistics by Simon Thomas in Maths support.

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Taxonomy: mathcentre

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Simon Thomas 5 years, 11 months ago

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