CSEC Statistics pt1

The mean of the following numbers is 15. 14, 10, 18, c, 21, 15, 14. The value of c is?

• A) 13
• B) 14
• C) 20
• D) 91

A bag contains 2 red, 4 yellow, and 6 blue balls. The probability of drawing a blue ball from the bag is?

• A) 1/6
• B) 1/3
• C) 1/2
• D) 6/11

Given the numbers: 4, 7, 10, 18, 18, 27.. . what is the mode?

• A) 10
• B) 14
• C) 18
• D) 27

In a class of 20 students, 12 are girls. What is the probability that a student chosen at random is a boy?

• A) 1/20
• B) 8/20
• C) 12/20
• D) 8/12

Each of the letters of the word 'CHANCE' is written on a slip of paper similar in size and shape. The slips of paper are then placed in a bag and the bag thoroughly shaken. What is the probability of drawing the letter "C"

• A) 1/3
• B) 1/5
• C) 1/6
• D) 2/3

Marian scores on her nine spelling tests are 5, 7, 7, 4, 5, 4, 7, 6, 6. Therefore her median score on these nine tests is

• A) 4
• B) 5
• C) 6
• D) 7

If the mean of 4 numbers 4, 8, x and 12 is 10, then x is

• A) 4
• B) 10
• C) 12
• D) 16

The boundaries of the class interval 10-14 are best recorded as

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Five hundred students wrote an examination. The probability of a randomly selected student failing the examination is 1/5. How many students are expected to pass?

• A) 100
• B) 200
• C) 300
• D) 400

if the mean of the numbers 2x, 3x, 4x and 3x is 12, then the sum of the numbers is

• A) 4
• B) 12
• C) 48
• D) 80