BUSINESS STATISTIC

Business Statistic

Business Statistic

Exercise on Chapter 4

Answer No. 1

There are 5 sample points which are 0, 1, 2, 3, 4

Houses Sold

Probability

0

0.3

1

0.4

2

0.2

3

0.08

4

0.02

In a given day, the probability of not sell is 0.3

The probability of selling (X > = 2):

=

P (2)

+

P (3)

+

P (4)

=

0.200

+

0.080

+

0.020

=

0.30

The probability of selling 1 or 2 house:

=

P (1)

+

P (2)

=

0.4

+

0.2

=

0.6

1- P(X > = 3):

=

1

-

P (3)

-

P (4)

=

1

-

0.08

-

0.02

=

0.9

Answer No. 2

For the sum of the spots is 3:

2

=

0.06

36

P (4 or more) =

1

x

1

=

1

=

9

2

2

4

36

P (sum of not 3) = 34/ 36 = ...