A school contains students ingrades 1,2,3,4,5 and 6. Grades 2,3,4,5 and 6 all co

Question

A school contains students ingrades 1,2,3,4,5 and 6. Grades 2,3,4,5 and 6 all contain the samenumber of students, but there are twice this number in grade 1.

a)If a student is selected at random from a list of all thestudents in the school, what is the probability that he will be ingrade 3? b)What is the probability that the selected student will be inan odd-numbered grade? A school contains students ingrades 1,2,3,4,5 and 6. Grades 2,3,4,5 and 6 all contain the samenumber of students, but there are twice this number in grade 1.

a)If a student is selected at random from a list of all thestudents in the school, what is the probability that he will be ingrade 3? b)What is the probability that the selected student will be inan odd-numbered grade?

Explanation / Answer

2,3,4,5,6 = x students 1=2x students total number of students=7x prob of being in 3 grade=x/7x=1/7 prob of being in a odd number (1,3,5) = 4x/7x=4/7

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