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110. 1f a = then determinant of the matrix a-2a will be 2 a- 31 a-2a hrtur ti hi bt (1) 1 (2) 3 (3) 5 (4) 25 111. the mean weight of 150 students in a certain c
110. 1f A = then determinant of the matrix A-2A will be 2 A- 31 A-2A HRTUR TI HI BT (1) 1 (2) 3 (3) 5 (4) 25 111. The mean weight of 150 students in a certain class is 60 kg. The mean weight of oys in the class is 70 kg and that of girls is 55 kg. The number of boys and girls in the class will be (1) Boys: 10, Girls 25 (2) Boys: 20, Girls: 50 3) Boys: 50, Girls: 100 (4) Boys: 75, Girls : 140 7E RT 150 3 staa a 60 kg I T 3itaa zaa 70 kg (1) 3 10, 7şf: 25 (2) Tg 20, TsAi: 50 (3) : 50, Tşei 100 (4) T3 75, Tzfai 140 112. For a distribution, the coefficient of variation is 22-5% and the value of meanis 7-5. The standard deviation will be (2) 1-56 (3) 169 (4) 1-85 (1) 1-45 113, With bw =0 5, T = 0-8 and variance ofY = 16. The standard deviation of X wiln be byy 0-5, r = 0-8 dAT SA Y =16. X HI-% faTCA EI (3) 10-0 (4) 256 (2) 25 (1) 6-4 46 (18)
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Ashish sharma
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answer -111 ..Total students in class =150 mean weight=60kg total weight =150×60=9000kg Let the total number of boys =x mean weight of boys =70kg total weight of boys =70×x=70xkg total number of girls = total students - no. of boys =150−x mean weight of girls=55kg total weight of girls =55×(150−x)=55×150−55x=(8250−55x)kg Total weight = weight of boys + weight of girls 9000=70x+(8250−55x) 9000=70x+8250−55x 9000−8250=70x−55x 750=15x x=15750 x=50 So number of boys =50 number of girls =150−50=100
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option C is correct
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Ashish sharma Best Answer
Ans-112 option C