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Data and Statistical Interpretation Flashcards

7 cards from real BKSB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Data and Statistical Interpretation flashcards as text

  1. The mean of five numbers is 14. Four of the numbers are 10, 12, 16, and 18. What is the fifth number?

    Answer: 14

    Sum = 5 × 14 = 70; known sum = 10+12+16+18 = 56; fifth number = 70 − 56 = 14.

  2. A dual bar chart compares male and female test results. Males averaged 72 and females averaged 68. What is the combined average if there are equal numbers of each?

    Answer: 70

    With equal numbers, combined average = (72 + 68) ÷ 2 = 70.

  3. A cumulative frequency graph shows that 60 out of 100 students scored below 55 marks. What is the probability that a randomly selected student scored 55 or above?

    Answer: 0.4

    100 − 60 = 40 students scored 55 or above, so probability = 40/100 = 0.4.

  4. In a data set, the lower quartile is 20 and the upper quartile is 40. What is the interquartile range (IQR)?

    Answer: 20

    IQR = upper quartile − lower quartile = 40 − 20 = 20.

  5. A pictogram uses one symbol to represent 4 people. A category shows 6 full symbols and one half symbol. How many people does this represent?

    Answer: 26

    6 full symbols = 6 × 4 = 24; half symbol = 2; total = 24 + 2 = 26.

  6. A survey of 80 people found 60% own a car. How many people in the survey do NOT own a car?

    Answer: 32

    60% own a car means 40% do not; 40% of 80 = 0.40 × 80 = 32.

  7. A stem-and-leaf diagram shows stems 2, 3, 4 with leaves: 2|3,5,7 and 3|1,4,6,9 and 4|2,5. Which stem has the most data values?

    Answer: 3

    Stem 3 has 4 leaves (1,4,6,9) which is more than stem 2 (3 leaves) or stem 4 (2 leaves).