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Statistics and Average

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Question: If a mark of 76 or higher represents A grade, what is the nearest percentage of students who receive an A?

  1. a.
    14%
  2. b.
    17%
  3. c.
    20%
  4. d.
    9%
  5. e.
    13%
Answer: c

Question: The average of Selim’s marks in 7 subjects is 75. His average in six subjects excluding Science is 72. How many marks did he get in Science?

  1. a.
    72
  2. b.
    90
  3. c.
    93
  4. d.
    98
  5. e.
    86
Answer: c

Question: A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:

  1. a.
    72
  2. b.
    36
  3. c.
    180
  4. d.
    30
  5. e.
    45
Answer: a

Question: The average temperature on Wednesday,Thursday and Friday was 25°c. The average temperature on Thursday, Friday and Saturday was 24°c. If the temperature on saterday was 27°c, what was the temperature on Wednesday?

  1. a.
    24°c
  2. b.
    21°c
  3. c.
    27°c
  4. d.
    30°c
  5. e.
    None of these
Answer: d

Question: The average of 6 numbers is 25. If 3 more numbers with an average of 22 are added to these numbers, what will be the average of the combined 9 numbers?

  1. a.
    20
  2. b.
    22
  3. c.
    24
  4. d.
    25
Answer: c

Question: If the average of four numbers k, 2k + 3, 3k - 5, and 5k + 1 is 63. What is the value of k?

  1. a.
    11
  2. b.
    15.75
  3. c.
    22
  4. d.
    23
  5. e.
    25.3
Answer: d

Question: The rent of a guest house was Tk. 50 per day for first three days, Tk. 100 per day for the next 5 days and Tk. 300 per day for other days. The registration fee in the beginning is Tk. 50. If one has to pay Tk. 1300, for how many days he availed of this facility?

  1. a.
    10
  2. b.
    12
  3. c.
    15
  4. d.
    8
  5. e.
    9
Answer: a

Question: If 6 and x have the same mean as 2, 4 and 24, what is the value of x?

  1. a.
    5
  2. b.
    10
  3. c.
    14
  4. d.
    36
Answer: c

Question: The average of 6 number is 8.5, when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

  1. a.
    7.8
  2. b.
    9.8
  3. c.
    10
  4. d.
    12.4
  5. e.
    15
Answer: e

Question: Francis had an average of 75 on her first four Geometry test. After taking the next test her average dropped to 72. How much did she get in fifth test?

  1. a.
    58
  2. b.
    60
  3. c.
    73.5
  4. d.
    54
  5. e.
    56
Answer: b

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