Page 311 - Start Up Mathematics_7

5. Match the events in column I with their respective probabilities in column II.

Column I Column II
(Events) (Probabilities)

(i) In a class consisting of 20 boys and 30 girls, a student selected at 1
random is a girl (a) 2

(ii) A student can get any of the 5 equally likely grades, i.e., A, B, C, D or E. 3
The probability of a student getting A grade is (b) 7

(iii) The shaded part in is represented by the probability 3
(c) 5

(iv) From a box containing 3 vanilla ice cream cups and 4 chocolate ice
cream cups, one is picked at random. The probability of drawing a (d) 1
vanilla cup is 4

(v) A regular tetrahedron die has pictures of
a fish ( ), snake ( ) and

butterfly ( ) engraved on three (e) 1
5

of its faces with nothing on the fourth face.
If such a die is rolled once find the probability
that all three pictures are visible.

Values and Life Skills

A game is said to be fair if the chances of winning is same for the players. Diya and Greg
each have a try at the spinners shown below. Which of these would be fair to both of them?
Should you be fair while playing or not? Do you think cheating is a good habit?

Greg Greg Diya Greg
Diya
(a) (b) Diya (c) Greg

Greg Diya Diya
Spin again Greg

Greg Greg Diya Greg
Diya Greg Greg
Diya Greg Diya
(d) (e) Diya Greg (f) Greg
Greg Diya Greg
Choose any Diya
Greg Diya one at random Diya

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