The mean weight of 25 students of a class is 52 kg. if the mean weight of the first 13 student of the class is 48 kg and that of the last 13 students is 55kg , find the weight of the 13th student.
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`45%` of the student of a class participated in Physics Olympiad Math Olympiad. 4 students participated in both. Find how many students. (i) Are there
Correct Answer - (i) 40 , (ii) 18 , (iii) 36
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A class has `175` students, The following description gives the number of students studying one or more of the subjects in this class, Mathematics `10
Correct Answer - (i) 60,35,13, (ii) 32
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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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A student sitting in the last row of the class room is not able to read clearly the writing on the black board
Correct option is A) myopia
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In a class there are 20 boys and the remaining students are girls. The mean weights of the total 50 students is 23 kg.
Total weight of girls and boys = Mean x no. of students = 23 x 50 = 1150 Weight of boys = Mean of boys x no. of boys = 30 x 20...
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If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.
Correct option is (B) 144.1 cm The mean height of 10 boys \(=\frac{3\times142+7\times145}{10}\) \(=\frac{426+1015}{10}\) \(=\frac{1441}{10}\) = 144.1 cm
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If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.
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In a senior secondary school,80 students play football or hockey.The number that play football is 5 more than twice the number that play hockey.If 15 students play both games and every student in the school plays at least one game,find (i)the number of students that play football (ii)the number of students that play football but not hockey (iii)the number of students that play hockey but not football.
I thought F or H = 80 is giving by n(F u H) = n(F) + n(H) - n(F n H)
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c. The in weight. The weight of \( 6 students \) are \( 49 kg , 52 kg , 51 kg , 58 kg \), and \( 55 kg \) respectively. Find the mean weight.
MEAN = SUM OF OBSERVATION / TOTAL NO. OF OBSERVATION = 49+52+51+58+55/5= 265/5= 53
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