*Board of Intermediate Education Karachi* *Statistics XII Commerce Group* *SECTION 'B' - SHORT ANSWER QUESTIONS* Q1. Differentiate between (with definition and examples): a. Qualitative and Quantitative / Discrete and Continuous Variable. b. Primary and Secondary Data (with source of collection of primary data). c. Descriptive and Inferential Statistics. Q2. Define the following: - a. Population - b. Parameter - c. Constant - d. Variable - e. Sample Space - f. Array - g. Probability and its Basic Properties - h. Mutually Exclusive, Dependent & Independent Events Q3. What is Statistics? Write its characteristics. Give at least two examples of daily life where statistics can be applied. Q4. (A) In how many ways can the letters of the following words be arranged? a) ACCOUNTANCY b) YESTERDAY c) COLLEGE d) PROBABILITY e) STATISTICS f) PROFESSION g) ECONOMY (B) How many two-digit numbers can be formed from the digits 4, 5, 6, 7, 8: a) Repeated? b) Not Repeated? Q5. (A) A fair coin is tossed two times. What is the probability of getting: a) One Head b) Two Heads c) Two Tails d) One Tail (B) A card is drawn from a deck of 52 playing cards. What is the probability that it is: a) Diamond b) Face Card (C) A bag contains 6 green and 4 white balls. Three balls are drawn at random. What is the probability of getting 2 green and 1 white ball? Q6. For a set of 15 observations, the mean came out to be 12. Later it was discovered that an observation 20 was incorrectly recorded instead of 02. Calculate the correct mean. Q7. (A) How many three-digit numbers can be formed from the digits 1, 4, 5, 7, 8, 9: a) With repetition b) Without repetition