In a class, the average marks of boys is 520 and that of the girls is 420. If the average marks per student is 500, the percentage of boys in the class is …….
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m balls are distributed among a boys and b girls. Prove that the probability that odd numbers of balls are distributed to boys is `((b+a)^m - (b+a)^m)
Suppose than p and q, respectively, denote the probabilities that a thing goes to a man and a women. `p=(a)/(a+b)and q=(b)/(a+b)` Now, the probabilities of 0,1,2,3,… thing going to men...
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Two thirds of eth students in a class are boys and the rest girls. It is known that eh probability of a girl getting a first class is 0.25 and that of
Correct Answer - `0.27` We have `P(G)=1//3and P(B)=2//3` ` P(A//G)=0.25and P(A//B)=0.28` Here, A is the event that student chosen will get a first class. So, using total probability theorem, `P(A)=P(B)P(A//B)+P(G)P(A//G)` `2/3xx0.28+1/3xx0.25=0.27`
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A class consists of 80 students, 25 of them are girls and 55 are boys. If 10 of them are rich and the remaining are poor and also 20 of them are intel
Correct Answer - C Total number of the students is 80. Total number of boys is 55. Therefore are 10 rich, 70 por, 20 intelligent students in the class. Therefore, required...
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Five oys and three girls are sitting in a row of `8` seats. Number of ways in which they can be seated so that not all the girls sit side by side is
Correct Answer - A `(a)` Total no. of arrangement if all the girls do not seat side by side `=["all arrangement"-"girls seat side by side"]` `=8!-(6!xx3!)` `=6!(56-6)=6!xx50` `=720xx50=36000`
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The number of ways in which six boys and six girls can be seated at a round table so that no two girls sit together and two particular girls do not si
Correct Answer - C `(c )` The boys can be seated in `5!` ways. If the girls `g_(1)` and `g_(2)` do not want to sit by the side of `A_(1)` (say)....
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In an examination, Salim secured `52%` marks and got 114 marks more than the pass marks and A zam secured `39%` marks and got 36 marks more than the p
Correct Answer - `198,33%`
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Shiva can type `x` words per hour while Sreevias can type `y` words per hour. Shiva works for 5 hours per day and Sreenvias works for 7 hours per day.
Correct Answer - `5x + 7y ge 700`
2 Answers 1 views
5 boys & 4 girls sit in a straight line. Find the number of ways in which they can be seated if 2 girls aretogether & the other 2 are also together bu
Correct Answer - 43200
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A profit of Rs. 300 is made on class I ticket , and Rs. 800 is made on class II ticket. If x and y are the number of tickets of class I and class II s
Correct Answer - f=300x+800y
2 Answers 1 views
There are 50 students in a class, of which 40 are boys. The average weight of the class is 44 kg and that of the grils is 40 kg. find the average weig
Correct Answer - 45 kg
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