The probability of success of three students X, Y and Z in the one examination are 1/5, 1/4 and 1/3 respectively. Find the probability of success of at least two.
P(X) = 15, P(Y) =14 , P(Z) = 13
Required probability:
= [ P(A)P(B){1−P(C)} ] + [ {1−P(A)}P(B)P(C) ] + [ P(A)P(C){1−P(B)} ] + P(A)P(B)P(C)
=14*13*45+34*13*15+23*14*15+14*13*15
= 460+360+260+160= 1060= 16
Find the range and mode of the data 17, 18, 28, 19, 16, 18, 17, 29, 18
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