there are 1000 junior and 800 senior students in a class.and there are 60 sibling pairs where each pair has 1 junior and 1 senior. one student is chosen from senior and 1 from junior randomly.what is the probability that the two selected students are from a sibling pair?
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The options for this question are missing: Following are the options:
A) 7140/800000
B) 8140/800000
C) 7580/845000
D) 7540/800000
Answer: 7140/800000
Number of junior students: 1000
Number of Senior Students: 800
60 sibling pair = 2 x 60 = 120 students
The probability of the student being chosen from 800 and 1000 students is 1.
1 student chosen from senior and 1 student chosen from junior
n(s) = 800 x 1000 = 800000
n(E) = 120C2 = 7140
P(E) = n(E)/n(S) = 7140⁄800000
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