9 Sam collects commemorative stamps. Among his favorites are Maria Goeppert Mayer stamps and the new cowaphant stamps. On Sam's desk are four envelopes with stamps in them. The table below shows how many of each kind of stamp are in each envelope. envelope Maria Goeppert Mayer cowaphant A 1 4 В 3 C 10 10 18 Sam randomly selects an envelope (each envelope equally likely) and then randomly selects a stamp from within that envelope (each stamp in the envelope equally likely). a) What is the probability that Sam chooses a cowaphant stamp? b) If Sam chooses a cowaphant stamp, what is the probability that the envelope was envelope A?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 13CYU
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9 Sam collects commemorative stamps. Among his favorites are Maria Goeppert Mayer stamps
and the
new cowaphant stamps.
On Sam's desk are four envelopes with stamps in them. The table below shows how many of each kind of stamp
are in each envelope.
envelope Maria Goeppert Mayer cowaphant
A
1
4
В
7
10
10
D
18
Sam randomly selects an envelope (each envelope equally likely) and then randomly selects a stamp from within that
envelope (each stamp in the envelope equally likely).
a) What is the probability that Sam chooses a cowaphant stamp?
b) If Sam chooses a cowaphant stamp, what is the probability that the envelope was envelope A?
Transcribed Image Text:9 Sam collects commemorative stamps. Among his favorites are Maria Goeppert Mayer stamps and the new cowaphant stamps. On Sam's desk are four envelopes with stamps in them. The table below shows how many of each kind of stamp are in each envelope. envelope Maria Goeppert Mayer cowaphant A 1 4 В 7 10 10 D 18 Sam randomly selects an envelope (each envelope equally likely) and then randomly selects a stamp from within that envelope (each stamp in the envelope equally likely). a) What is the probability that Sam chooses a cowaphant stamp? b) If Sam chooses a cowaphant stamp, what is the probability that the envelope was envelope A?
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