Q2 of 8 Page 307

A coin is tossed 100 times and the following outcomes are recorded

Head:45 times


Tails:55 times from the experiment


a) Compute the probability of each outcomes.


b) Find the sum of probabilities of all outcomes.

Given that the coin is tossed 100 times, so sample space consist of 100 possible outcomes


Head turns up 45 times


Tails turns up 55 times


a) let E be the event of head turning up


Then P (E) =


Let F be event of tails turning up


P (F) =


b) sum of possibility of outcome


=


More from this chapter

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1

A die has six faces numbered from 1 to 6. It is rolled and number on the top face is noted. When this is treated as a random trial.

a) What are the possible outcomes?


b) Are they equally likely? Why?


c) Find the probability of a composite number turning up on the top face.

 3

A spinner has four colours as shown in the figure. When we spin it once, find

a) At which colour, is the pointer more likely to stop?


b) At which colour, is the pointer less likely to stop?


c) At which colours, is the pointer equally likely to stop?


d) What is the chance the pointer will stop on white?


e) Is there any colour at which the pointer certainly stops?


 4

A bag contains five green marbles, three blue marbles, two red marbles, and two yellow marbles. One marble is drawn out randomly.

a) Are the four different colour outcomes equally likely? Explain.


b) Find the probability of drawing each colour marble i.e. , P(green), P(blue), P(red) and P(yellow)


c) Find the sum of their probabilities.

 5

A letter is chosen from English alphabet. Find the probability of the letters being

a) A vowel


b) a letter comes after P


c) A vowel or a consonant


d) Not a vowel