A teacher has 12 red pens, 8 blue pens, 5 black pens, and 7 green pens. she hands one, at random, to each student in the class
1. find the probability that the first student is given a red pen.
2. Deshi wants to have a red pen. By the time the teacher gets to Deshi, she has given out two pens of each colour. Has Deshi's chance of getting a red pen increased or decreased? Give a reason for your answer?
Answers
Answered by
2
Answer:
12 red
8 blue
5 black
7 green
total = 32
probability of the first student getting a red pen is 12/32
which can be cut to 6/16
when the teacher gave 2 of each pen it became
10 red
6 blue
3 black
5 green
total 24
so chances of getting a red pen is
10/24
it can be cut to 5/12
so, the chances have increased
Answered by
4
Answer:
Total outcomes =32
event (E) = 1st student is given a red pen
outcomes of the red pens = 12
P(e) = outcomes of the event 12 3
___________________ ___ = ____
Total outcomes 32 8
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