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.
A) 144 cm
B) 144.1 cm
C) 144.2 cm
D) 144.4 cm
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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
Correct Answer - 39 kg
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The heights (in cm) of 9 students of a class are 148,144,152,155,160,147,150,149,145. find the median height.
Correct Answer - 147 cm
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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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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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1. The heights of 15 boys of a shoot are given \( cm \) : \( 148,128,146,143,152,139,140,142,149,154,132,157,165,139,142 \) Arrange the above data in an ascending order and find: a. The height of the tallest boy. b. The height of the shortest boy. c. The mean height.
Please send me answer of the question
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The average weight of 55 students is 55 kg , and the average weight of another 45 students is 45 kg . Find the average weight of all the students .
Correct Answer - c Average = `("Sum of the quantities")/("Number of the quantities")`
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