A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a
king of heart is:
Here, n(S) = 52.
Let E = event of getting a queen of club or a king of heart.
Then, n(E) = 2.
P(E) =n(E)/n(S)=2/52=1/26.
The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is
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