Q. 93.8( 12 Votes )
A number is selected at random from the numbers 3, 5, 5, 7, 7, 7, 9, 9, 9, 9 The probability that the selected number is their average is
A. 
B. 
C. 
D. 
Answer :
Total numbers of elementary events are: 10
Let E be the event of getting selected number being the average
Favorable outcome is = 70 /10 = 7
Average = total of observations/ numbers of observation
Total of observations = 3+ 5+ 5+ 7+ 7+ 7+ 9+ 9 + 9+ 9 = 70
Numbers of observation = 7
Numbers of favorable outcomes are: 3
P ( selecting average number) = P (E) = 3/10
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