43. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

A.35.2

B.36.1

C.36.5

D.39.1

44. A pupil?s marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is :

A.10

B.20

C.40

D.73

45. The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is :

A.11

B.11.3

C.11.4

D.11.5

46. The average weight of three boys A, B and C is 54 1/3 kg, while the average weight of three boys B, D and E is 53 kg. What is the average weight of A, B, C, D and E?

A.52.4 kg

B.53.2 kg

C.53.8 kg

D.Data inadequate

47. The average temperature of the town in the first four days of a month was 58 degrees. The average for the second, third, fourth, and fifth days was 60 degrees. If the temperatures of the first and fifth days were in the ratio 7 : 8, then what is the temperature on the fifth day?

A.64 degrees

B.62 degrees

C.56 degrees

D.None of these

48. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is :

A.17 kg

B.20 kg

C.26 kg

D.31 kg

49. The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is :

A.Rs.3500

B.Rs.4000

C.Rs.4050

D.Rs.5000

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