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15 May 2019, 23:54
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
76% (02:02) correct
24%
(02:31)
wrong
based on 160
sessions
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Not Attempted Yet
A certain school has 50 students assigned randomly to 5 distinct classes, and each student is assigned to only one class. If the quantities of students in the 5 classes are consecutive numbers, what is the probability that a given student is in one of the two largest classes?
A. 48%
B. 46%
C. 42%
D. 38%
E. 34%
A. 48%
B. 46%
C. 42%
D. 38%
E. 34%
16 May 2019, 00:01
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number of students assigned randomly to 5 distinct classes- x-2, x-1,x, x+1 and x+2
x-2+x-1+x+ x+1 + x+2=50
5x=50
x=10
Number of students in 2 largest classes= 11+12=23
probability that a given student is in one of the two largest classes= 23/50= 0.46 or 46%
x-2+x-1+x+ x+1 + x+2=50
5x=50
x=10
Number of students in 2 largest classes= 11+12=23
probability that a given student is in one of the two largest classes= 23/50= 0.46 or 46%
Archit3110
Major Poster
16 May 2019, 03:31
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Bunuel
the consective trail will be ; 8,9,10,11,12
largest two classes strength ; 11+12 ; 23
P ; 23/50 ; 46%
IMO B
