4. In a certain
clas of
studets,
there are 11 boys from Saginaw, 7 girs rom Sagina, 5 boys
from Midland, and 4 girls from Midland.
(a)
If the teacher calls upon a student to answera question, what is the probability that the
student will be from Saginaw?
e()
=
149
2+
(b)
Ir the teacher calls upon a student to answer a question, what is the probability that the
student will be a boy?
Pla)=
29-
(©) If the teacher calls upon a student to answera question, what is the probability that the
Btudent will be a by OR fromSaginaw?
)
cCous)
=
e()+
e Cc)- p
+ -
(d)
If the teacher calls upon a student to answera question, what ls the probability that the
student
will be a girl OR fromnSaginaw?
r(ous)=
e(o)+p)-
(e)
If the teacher calls upon a student to answer a question, what is the probability that the
student will be a girl AND fron Midland?
rCGnm)
24
()
If the teachercalls upon a student toansweraquestion, what is the probability that the
student will be a boy AND from Midland?
S
rlonm)=
(8) If the teacher calls upon a girl to answer a question, what is the probability that the
student will be from Midland?
PMIG)
4
PC
(h)
If the tescher calls upon a student from Midland to answer a question, what ls the prob-
ability that thestudent will be a girl?
4
S
t.)
PCtuldbis w.lyl
-
Page 3
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