The survey about the investment habits of local citizens
is given in contingency table:
Age Stocks
[S] Bonds [B] Savings Accounts [A] Totals
18-29 [Y] 6 2 15 23
30-49 [M] 14 5 14 33
50 or over [O] 32 20 12 64
Totals =52 =27 =41 =120
What is the probability of the
number of citizens holding either stocks or bonds?
[Marks -01]
SOLUTION
Number of citizens holding
stocks = n (S) = 52
Number of citizens holding
Bonds = n(B) = 27
n (B U S) = 79
total citizens = n (T) = 120
Probability of the number of citizens holding either
stocks or bonds = P (B U S)
=
79/120
= 0.658
= 56.8%
What
is the probability of citizens holding either bonds or savings accounts in the
age group of 18-29?
SOLUTION
n (A U B Ռ Y) = 17
Probability of citizens holding either bonds or
savings accounts = P (A)
P(A ) = 17/23
= 0.739
= 73.9%
What is the probability of
citizens holding only stocks?
SOLUTION
n
(S) =52
Probability
of citizens holding only stocks = P (A)
= 52/120
= 0.433
= 43.3%
No comments:
Post a Comment