Statistics – Exercise 1.5.5 – Class IX

 

  1. Two unbiased 6 – faced die are thrown. What is the total number out comes?

Solution:

total number of outcomes = 6 × 6 = 36


  1. A die has the faces numbered 2, 4, 6, 8, 10 and 12. It is thrown once. What is the probability that an even numbered face shows up?

Solution:

Probability that even number farm shows up = 6/6 = 1


  1. In a pack of 52 playing cards, a card was selected at random. What is the probability that the card selected was both red and black?

Solution:

Zero: A card cannot be both red and black.


  1. Weather forecast made for 30 days in a month was recorded and found that it was correct for 21 days. What is the probability that on a randomly selected day, the forecast is (i) Correct and (ii) Not correct?

Solution:

Probability of correct forecast = 21/30 = 7/10

Probability of correct forecast= 9/30 = 3/10


 

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