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Statistics and Average

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Question: There are 8 job applicants sitting in waiting room; 4 women and 4 men. If two of the applicants are selected at random, what is the probability that both will be women?

  1. a.
    1/2
  2. b.
    3/7
  3. c.
    1/4
  4. d.
    3/14
  5. e.
    none of these
Answer: d

Question: If the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is--

  1. a.
    6
  2. b.
    7
  3. c.
    8
  4. d.
    9
  5. e.
    None of these
Answer: a

Question: If the individual marks of all students are arranged in increasing order, which of the following is a possible mark of the 36th position in the list?

  1. a.
    60
  2. b.
    61
  3. c.
    78
  4. d.
    39
  5. e.
    48
Answer: a

Question: If 3a +5b = 10 and 5a + 3b = 30, what is the average (arithmetic mean) of a and b?

  1. a.
    4
  2. b.
    2.5
  3. c.
    3.5
  4. d.
    4.5
  5. e.
    3
Answer: b

Question: If Taka 4500 was invested in bonds of acorporation when the price per bond was Tk.9.00 and Taka 3000 was invested in bonds of another corporation when the price was Tk.10.00 per bond, What was the average price of bonds purchased?

  1. a.
    Tk.9.625
  2. b.
    Tk.9.50
  3. c.
    Tk.9.40
  4. d.
    Tk.9.375
  5. e.
    None of these
Answer: d

Question: The average of 5 numbers is 40. If 2 more numbers with an average of 21 are added to these numbers, what will be the average of the combined numbers?

  1. a.
    8.7
  2. b.
    30.1
  3. c.
    30.3
  4. d.
    34.6
Answer: d

Question: The average of 6, 8 and 10 equals the average of 7, 9 and --

  1. a.
    8
  2. b.
    9
  3. c.
    11
  4. d.
    1
  5. e.
    7
Answer: a

Question: Salma's average in four tests is 80%. What mark does she need score in her fifth test to make her average 84%?

  1. a.
    100%
  2. b.
    94%
  3. c.
    84%
  4. d.
    96%
  5. e.
    None of these
Answer: a

Question: The average age of 40 employees in abranch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

  1. a.
    55.5
  2. b.
    50
  3. c.
    50.5
  4. d.
    20.5
  5. e.
    None of these
Answer: a

Question: Sum of P and Q is 72 and the value of R is 42. What is the average of P, Q and R?

  1. a.
    32
  2. b.
    34
  3. c.
    36
  4. d.
    38
  5. e.
    30
Answer: d

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