QUES 67

If log10(x-y) = 3 and log10(x+y) = 4, ( 10 is the base of the logarithm !!), then x=

a) 3.5

b) 11000

c) 5500

d) 103.5

**Answer-c**QUES 68

The real solution(s) to the equation |x-1|=2x+1 is/are:

a)-2

b) -2,0

c) -1

d) 0

**Answer-d**QUES 69

Four dice are thrown. What is the probability that the same number appears on each of them?

a) 1/36

b) 1/18

c) 1/216

d) None of the above

**Answer-c**QUES 70

**Answer-a**QUES 71

The mean of a data set is equal to 10 and its standard deviation is equal to 1. If we add 5 to each data value, then the mean and standard deviation become:

a)mean= 15, standard deviation=6

b)mean= 10, standard deviation=6

c)mean= 15, standard deviation=1

d)mean= 10, standard deviation=1

**Answer-c**QUES 72

The sum

summation k from 1 to 100 (3+k) =

a)5053

b)5050

c)300

d)5350

**Answer-d**QUES 73

How many 4-digit numbers can be formed, if no digit is used more than once?

a)5040

b)3024

c)4536

d)None of the above

**Answer-c**QUES 74

**Answer-b**Question nos.

**75-78** are to be answered on the basis of following:

The following table shows the marginal cost of producing nth ( n=1,2,...10) unit of output by a competitive firm:

It is also given that the total cost of producing 3 units of output is 7.

QUES 75

The total cost of producing 5 units of output ( correct up to two decimal places ) is:

a) 15.00

b) 9.30

c) 12.30

d) None of the above

**Answer-c**QUES 76

The average variable cost of producing 7 units of output ( correct up to two decimal places) is:

a) 2.60

b) 0.71

c) 3.03

d) None of the above

**Answer-a**QUES 77

The average cost of producing 9 units of output ( correct up to two decimal places) is:

a) 3.66

b) 3.99

c) 0.91

d) None of the above

**Answer-b**QUES 78

The profit-maximizing number of units of output for the firm, if the market price of the good is 6, is:

a)4

b)7

c)10

d)None of the above

**Answer-b**