WebApr 7, 2024 · In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is: a) $\dfrac{21}{46}$ b) $\dfrac{25}{117}$ c) $\dfrac{1}{50}$ ... It is given in the question that there are 15 boys and 10 girls, three students are selected at random, then we have to find the probability ... WebApr 5, 2024 · A class contains 10 boys and 15 girls. 8 students are to be selected at random from the class without replacement. Let X be the number of boys selected and Y the number of girls selected. Find E ( X − Y). I could chalk out the table: E ( X − Y) = − 8 when X = 0 and Y = 8 E ( X − Y) = − 7 when X = 1 and Y = 7 etc etc
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SOLUTION: There are 10 girls and 15 boys in a class. If a …
WebIn a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is: A. 21 46 B. 25 117 C. 1 50 D. 3 25 Answer: Option A Solution (By Examveda Team) Let S … WebJan 30, 2024 · As there are 10 girls and 20 boys, there are a total of 30 students in the class. If the mean mark for all 30 students is 70, this means that there was a combined total score of 70 x 30 = 2100. If the mean mark for all 10 boys was 62, this means that there was a combined total score for boys of 62 x 10 = 620. WebSep 7, 2024 · In class 10A there are 30 boys and 20girls. In 10B there are 40 boys and 30girls. One student is to be selected from each class. In how many different ways we can select a pair of students. What is the probability of both being boys. What is the probability of getting one boy and one girl. What is the probability of getting at least one boy. medicated anti itch creams