| X | 2 | 3 | 4 | 5 |
| F | 2 | 5 | 2 | 1 |
From the table, the mean of the distribution is___________
2.2
2.5
3.2
4.5
Correct answer is C
Mean= ∑fx/∑f
=(4+15+8+5)/(2+5+2+1)
=32/10
=3.2
| X | 8 | 10 | 12 | 16 | 18 | 20 | 24 |
| F | 2 | 1 | 4 | 3 | 3 | 1 | 6 |
From the table, Calculate the mean?
24.0
17.0
18
27.2
Correct answer is B
Mean= ∑fx/∑f
=(16+10+48+48+54+20+144)/(2+1+4+3+3+1+6)
=340/20
=17.0
By calculation, the mean of the distribution is not 18
| X | 8 | 10 | 12 | 16 | 18 | 20 | 24 |
| F | 2 | 1 | 4 | 3 | 3 | 1 | 6 |
From the table, Calculate the median___________
24.0
17.0
18
16
Correct answer is D
When a group data is involved, cumulative frequency is used. The formula will be:
Median=[(N+1)/2]th
For member of odd number items. That is, where N is odd
Median=([N/2[N/2+1]th)/2
For member of odd number items. That is, where N is odd
Solution:
| X | 8 | 10 | 12 | 16 | 18 | 20 | 24 |
| F | 2 | 1 | 4 | 3 | 3 | 1 | 6 |
| Cumulative Frequency | 2 | 3 | 7 | 10 | 13 | 14 | 20 |
When a group data is involved, cumulative frequency is used. The formula will be:
Median=[(N+1)/2]th
For member of odd number items. That is, where N is odd
Median=([N/2[N/2+1]th)/2
For member of odd number items. That is, where N is odd
| No of Men | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Total Product(unit) | 200 | 440 | 540 | 600 | 640 | 660 | 660 | 640 |
If the price per unit is N2, what is the average revenue when 6 men are employed?
N110
N120
N220
N330
Correct answer is A
Average revenue is obtained by dividing the total revenue by the number of units sold. Thus we have;
\(\frac{660}{6}\) = 110
A market is in equilibrium when?
There is no government intervention
The demand is the same as the supply
Buyers and sellers are free to sell more goods
There is no free entry and exit
Correct answer is B
Market equilibrium is a market state where the supply in the market is equal to the demand in the market. The equilibrium price is the price of a good or service when the supply of it is equal to the demand for it in the market.