CIE Mathematics Paper-1: Specimen Questions 110 - 112 of 175

Question number: 110

Short Answer Question▾

Write in Short

The surface area of the Saturn is 42 700 000 000 kilometers2 . Write this number in standard form.

Explanation

Here,

(a) The surface area of the Saturn is 42 700 000 000 kilometers2.

So, standard from will be: 42.7×109kilometers2=42.7billionkilometers2.

Question number: 111

Short Answer Question▾

Write in Short

(a) Merry changed 380 into dollars ($) when the rate was $1=0.91 . How many dollars did she receive?

(b) Write 5.28769 correct to 3 significant figures.

Explanation

Here,

(a) Merry changed 380 into dollars ($) when the rate was $1=0.91 .

So, 0.91=1$

Then 380=?$

380×10.91=417.58$ 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 number: 112

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= 85100=1720

So, other flowers = 100%85%=15% .

Now, one seed is chosen at random, so probability of not produce a green flower = 15100=320 .

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

So, Probability of red pencils = 515=13

Probability of yellow pencils = 415

Probability of blue pencils = 615=25

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