Answer number 1 and 2 1. A survey of the students in a psychology class revealed that there were 19 femalesand 8 males. Of the 19 females, only 4 had no brothers or sisters, and 3 of the maleswere also the only child in the household. If a student is randomly selected from thisclass, then what is the probability of selecting a female who has no siblings?a.19b.C.d. 272. A colony of laboratory rats contains 18 white rats and 7 spotted rats. What is theprobability of randomly selecting a white rat from this colony?a.18b.25C.25d.18253. A jar contains 20 red marbles and 10 blue marbles. If you take a random sample= 3 marbles from this jar, and the first two marbles are both red, what is theof nprobability that the third marble also will be red?20a.3018b.28C. 30d. 28

only 4 had no brothers or sisters, and only child in the household. If a student is randomly sel at is the probability of selecting a female who has no si poratory rats contains 18 white rats and 7 spotted rats. andomly selecting a white rat from this colony?

only 4 had no brothers or sisters, and only child in the household. If a student is randomly sel at is the probability of selecting a female who has no si poratory rats contains 18 white rats and 7 spotted rats. andomly selecting a white rat from this colony?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.8: Probabilities Of Disjoint And Overlapping Events

Problem 2C

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Question

Answer number 1 and 2

1. A survey of the students in a psychology class revealed that there were 19 females
and 8 males. Of the 19 females, only 4 had no brothers or sisters, and 3 of the males
were also the only child in the household. If a student is randomly selected from this
class, then what is the probability of selecting a female who has no siblings?
a.
19
b.
C.
d. 27
2. A colony of laboratory rats contains 18 white rats and 7 spotted rats. What is the
probability of randomly selecting a white rat from this colony?
a.
18
b.
25
C.
25
d.
18
25
3. A jar contains 20 red marbles and 10 blue marbles. If you take a random sample
= 3 marbles from this jar, and the first two marbles are both red, what is the
of n
probability that the third marble also will be red?
20
a.
30
18
b.
28
C. 30
d. 28

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