ممكن احد يشرح لي قاعدة At least اللي في تشابتر 4
معليش نسيتها :(
ومشكورين مقدما
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coin في حالة
Find the probability of getting at least one …..
•
(1) A coin is tossed 3 times
N (s) = 23 = 8
... P (at least one tail) = N(s )/N( s–) 1 = 8/8-1 = 7/8
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(2) A coin is tossed 5 times :
N (s) = 25 = 32
... P (at least one head) = N N(s )( s–) 1 =32-1 / 32= 31/32
في حالة النسبه المئويه
Example:
It has been found that 6% of all automobiles on the road have
defective brakes. If 5 automobiles are stopped and checked by
the state police, find the probability that at least one will have
defective brakes.
A = at least one have defective brakes
A′ = no have defective brakes
P(defective) = 0.06 P(undefective) = 1 – 0.06 = 0.94
P(A′ ) = (0.94) (0.94) (0.94) (0.94) (0.94) = 0.7339
P(A) = 1 – P(A′ ) = 1 – 0.7339 = 0.266
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