IGCSE Mathematics Paper-1: Specimen Questions with Answers 110 - 112 of 324

Question 110

Write in Short

Short Answer▾

The surface area of the Saturn is 42 700 000 000 . Write this number in standard form.

Explanation

Here,

(a) The surface area of the Saturn is 42 700 000 000

So, standard from will be:

Question 111

Write in Short

Short Answer▾

(a) Merry changed into dollars when the rate was . How many dollars did she receive?

(b) Write 5.28769 correct to 3 significant figures.

Explanation

Here,

(a) Merry changed into dollars when the rate was .

So,

Then

she received.

(b) 5.28769 correct to 3 significant figures means there will be total of 3 digits:

So, we will get 5.29 because after digit 8 there is 7 which is greater than 5, so 8 will get round up and be 9.

Question 112

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Describe in Detail

Essay▾

(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 =

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