Review

It is the number of possible outcomes in tossing 2 coins.

• 2

• 6

• 4

• 8

Using the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, how many two-digit numbers can be formed with repetition?

• 81

• 18

• 100

• 9

It is the possible outcome in tossing 2 coins that the event is at least one head occurs.

• . {HH, HT, TH}

• {HH, TH, TT}

• {HT, TH}

• {HH}

Which of the following random variables is continuous

• The number of defective cellular phones in a box of 20.

• The number of correct answers in 20-item multiple choice test.

• The amount of rainfall in Manila City in a year.

• The number of patients who experience side effects after taking antibiotics.

Is the following a discrete probability distribution?

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.

• No, the sum of all the probabilities is not 1.

• No, some of probabilities are not between 0 and 1 inclusive

• Yes, because the distribution is symmetric

It is the list of sample space for this experiment: Tossing fair coin three times into the air.

• S = {HHH, HHT, HTT, HTT, THH, THT, TTH, TTT}

• S = {HHH, HHT, HTH, HTT, HHH, THT, TTH, TTT}

• S = {HHH, HHT, HTH, HTT, THH, THH, TTH, TTT}

• S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

Which of the following represents the average value of a random variable?

• Variance

• Mode

• Median

• Expected Value

What is the median age of a group of employees whose ages are 36, 38, 18, 10 16 and 15 years?

• 10

• 16

• 15          

• 17

. If the heights in centimetres of a group of students are 180, 180, 173, 170, and 167, what is the mean height of these students?

• 170

• 174

• 173

• 180

• 14.0

• 4.01

• 0.14

• 1.40