Dean Chalmers and Julian Gilbey Solutions for Chapter: Representation of Data, Exercise 4: EXERCISE 1B

Author:Dean Chalmers & Julian Gilbey

Dean Chalmers Mathematics Solutions for Exercise - Dean Chalmers and Julian Gilbey Solutions for Chapter: Representation of Data, Exercise 4: EXERCISE 1B

Attempt the practice questions on Chapter 1: Representation of Data, Exercise 4: EXERCISE 1B with hints and solutions to strengthen your understanding. Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book solutions are prepared by Experienced Embibe Experts.

Questions from Dean Chalmers and Julian Gilbey Solutions for Chapter: Representation of Data, Exercise 4: EXERCISE 1B with Hints & Solutions

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 3

The table below shows the heights, in metres, of 50 boys and of 50 girls.

Height m 1.2 1.3- 1.6- 1.8-1.9
No. boys f 7 11 26 6
No. girls f 10 22 16 2
Estimate the number of children whose heights are 1.7 metres or more.

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 4

The heights of 600 saplings are shown in the following table.

Height cm 0- 5- 15- 30-u
No. saplings f 64 232 240 64
Calculate an estimate of the number of saplings with heights that are:
less than 25 cm

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 4

The heights of 600 saplings are shown in the following table.

Height cm 0- 5- 15- 30-u
No. saplings f 64 232 240 64
Calculate an estimate of the number of saplings with heights that are:
between 7.5 and 19.5 cm.

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 5

Each of the 70 trainees at a secretarial college was asked to type a copy of a particular document. The times taken are shown, correct to the nearest 0.1 minutes, in the following table.

Time taken (min) 2.6-2.8 2.9-3.0 3.1-3.2 3.3-3.7
No. trainees f 15 25 20 10
It is given that 15 trainees took between 3.15 and b minutes. Calculate an estimate for the value of b when:
b>3.15

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 6

A railway line monitored 15% of its August train journeys to find their departure delay times. The results are shown below. It is given that 24 of these journeys were delayed by less than 2 minutes.
Question Image
How many journeys were monitored?

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 6

A railway line monitored 15% of its August train journeys to find their departure delay times. The results are shown below. It is given that 24 of these journeys were delayed by less than 2 minutes.
Question Image
Calculate an estimate of the number of these journeys that were delayed by:
1 to 3 minutes

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 7

A university investigated how much space on its computers' hard drives is used for data storage. The results are shown below. It is given that 40 hard drives use less than 20 GB for data storage.
Question Image
Find the total number of hard drives represented.

EASY
AS and A Level
IMPORTANT
Cambridge International AS & A Level Mathematics : Probability & Statistics 1 Course Book>Chapter 1 - Representation of Data>EXERCISE 1B>Q 7

A university investigated how much space on its computers' hard drives is used for data storage. The results are shown below. It is given that 40 hard drives use less than 20 GB for data storage.
Question Image
Calculate an estimate of the number of hard drives that use less than 50 GB.