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The average of marks of 14 student was c...

The average of marks of 14 student was calculated as 71. But It was later found that the marks of one student had been wrongly entered as 42 instead of 56 and of another as 74 instead of 32. The correct average is:

A

67

B

68

C

69

D

71

Text Solution

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The correct Answer is:
C
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The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is: किसी परीक्षा में 18 छात्रों के अंको का औसत 50 था। बाद में यह पाया गया कि किसी छात्र के अंक 36 के बजाय 63 लिखे गए थे। सही ओसत ___ होगा।

the average marks of 20 students is 70. Afterwards, it is found that the marks of 2 students are taken wrong as 54 and 74 instead of 64 and 84. Find the correct average.

Knowledge Check

  • The average of makrs of 17 students in an examination was calculated as 71. But it was later found that the mark of one student had been wrongly entered as 65 instead of 56 and another as 24 instead of 50. The correct average is:

    A
    70
    B
    71
    C
    72
    D
    73

  • The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is:

    A
    59
    B
    `59 . 5`
    C
    58
    D
    `58 . 5`

  • The average marks of 50 students in an examination was 65. It was later found that the marks of one student had been wrongly entered as 83 instead of 38. The correct average is?

    A
    63.9
    B
    64.5
    C
    64.7
    D
    64.1

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    In an exam, the average marks of 40 students is 75. Afterwards, it is found that the marks of 2 students are taken wrong as 56 and 38 instead of 65 and 69. Find the correct average.

    The average marks of 50 students in a class was found to be 64. If the marks of two students were incorrectly entered as 38 and 42 instead of 83 and 24 respectively, then what is the correct average? किसी कक्षा में 50 छात्रों के औसत अंक 64 पाए गए | यदि दो छात्रों के अंक भूलवश 83 एवं 24 के बजाय क्रमशः 38 और 42 लिखे गए थे, तो सही औसत ज्ञात करें |

    The average marks of 40 students in an examnation was 25. It was later found that the marks of one student had been wrongly entered as 73 instead of 37.What is the value of correct average?

    The average marks of 40 students in an examination was 25. It was later found that the marks of one student had been wrongly entered as 73 instead of 37. What is the value of correct average ?

    In an examination, the mean of marks scored by a class of 30 students was calculated as 58.5 Later on, it was detected that the marks of one student was wrongly copied as 57 instead of 75. Find the correct mean.

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