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danielmurillo28
05.02.2020 •
Mathematics
Probability with and without replacement:
an activity book has 21 pages of crossword puzzles, 18 pages of cryptograms, and 12 pages of mazes. bianca randomly selects a page, completes the activity, and then randomly selects another page to complete.
what is the probability that bianca first completes a maze and then completes a crossword puzzle.
ans:
42/425
28/289
21/88
33/51
Solved
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Ответ:
28/289
Step-by-step explanation:
First we need to find the total number of pages.
21 = crosswords puzzles
18 = cryptograms
12 = mazes
So there are:
21 + 18 + 12 = 51 pages total
The probability that Bianca will complete a maze first is 12/51.
The probability that her next choice will be a crossword puzzle is 21/51
Now to find the probability that Bianca will do a maze followed by a crossword puzzle is:
12/51 x 21/51
We can simplify the values by dividing everything by 3
Maze then crossword puzzle = 4/17 x 7/17
Maze then crossword puzzle = 28/289
Ответ:
Let x be the number of 3- point questions and y be the number of 5-points questions.
Step-by-step explanation: