3.
An office furniture store is having a sale on a certain type of office chair. The chairs
are priced at GH¢800 per chair. The probability distribution for the number of chairs
sold to an individual customer is
Number of chairs
1
2
3
4
Probability
0.15
0.40
0.10
0.35
a)
Find the probability that the number of chairs sold to an individual customer is
odd.
b)
Find the expected number and standard deviation of chairs sold to an
individual customer.
c)
Find the expected amount and standard deviation of the amount a customer
pays for the chairs he or she buys.
d)
The delivery charge for an order of chairs is GH¢100. Find the expected
amount and standard deviation of the amount a customer pays for the chairs
he or she buys, including the delivery charge.

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