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Gr11 Trigonometry revision

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Gr11 Trigonometry revision

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Trigonometry revision

Created by

Claudine Bongers
Claudine Bongers
South Africa

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Gr11 Trigonometry revision
 

Gr11 Trigonometry revisionOnline version

Trigonometry revision

by Claudine Bongers
1

Write down the total number of food items ordered from the menu during this hour.

Written answer

2

How long did it take to order the first 30 food items?

3

How many food items were ordered in the last 15 minutes? (only type the number)

Written answer

4

Determine the 75th percentile for the data.

Written answer

5

Calculate the interquartile range of the data. (Choose the answer closest to your answer as we read from the graph).

6

Calculate the mean of the data (round your answer to 2 decimals).

7

Calculate the standard deviation of the data (round your answer to 2 decimals).

8

How many learners are there in the class? (only type the number)

Written answer

9

Determine an estimate of the mean. (only type the number)

Written answer

10

What is the modal class?

11
QR

Video to explain previous set of questions. If watched, type 'yes'.

Written answer

12
QR

Video to recap on how to draw cumulative frequency graph (and a cool trick to calculate the estimated average using the calculator - we do need to see what the original numerator and denominator was though). After watching the video, type "yes".

Written answer

Feedback

Look on the y-axis as it is the "cumulative frequency of items ordered from a menu".

Read from the 30 on the y-axis, trace the horizontal line till the ogive curve and then drag it down to the time in minutes.

75% of 140 is at 105 items. So read from the y-axis to the curve and down.

Lower quartile is at 35 items (1/4*140) = 21,5 minutes (read from graph). IQR = Q3 - Q1 = 37-21,5 = 15,5 minutes

Mean = average = add all/number of data items.

Use the table mode on your calculator.

Add up the frequency.

Estimated mean = (multiply the midpoint of each interval with the frequencies and add them up) / the number of data items.

Class interval with biggest frequency.

 
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