IGCSE Mathematics Paper-1: Specimen Questions with Answers 112 - 113 of 175

Question number: 112

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Essay Question▾

Describe in Detail

(a) 85 % of the seeds will produce green flowers. One seed is chosen at random. Find probability that it will not produce a green flower?

(b) A box of 15 pencils has 5 red, 4 yellow and 6 blue pencils. One pencil is chosen at random from the box, calculate probability of

(i) Yellow, (ii) yellow or blue, (iii) green

Explanation

Here,

(a) 85 % of the seeds in a packet will produce green flowers. So, probability of green flowers=

So, other flowers = .

Now, one seed is chosen at random, so probability of not produce a green flower = .

(b) A box of 15 pencils contains 5 red, 4 yellow and 6 blue pencils.

So, Probability of red pencils =

Probability of yellow pencils =

Probability of blue pencils =

Question number: 113

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Grina plots a scatter diagram of speed against time taken. As the time taken increases, speed decreases. Which one of the following types of correlation will her scatter graph show?

Positive Negative Zero

Explanation

Here, as the time taken increases, speed decreases, scatter diagram will be shown as below: The Time Taken Increases, Speed Decreases, Scatter Diagram Graph is disply in detail.

So, it shows the negative correlation because it shows the negative gradient.