9Ch09 - Probability and single variable data analysis

A letter is randomly chosen from the word XYLOPHONE. The probability that it is an O is:

What are values of x and y in the two-way table?

• 
• 
• 
• 
• 

A bag contains 2 green balls and 1 red ball. Two balls are randomly selected without replacement.

What is he probability of selecting one of each colour?

From rolling a biased die, a class finds an experimental probability of 0.3 of rolling a 5.

From 500 rolls of the die, what is the expected number of 5s?

• 300

• 167

• 180

• 150

• 210

What is the median of the data in this stem-and-leaf plot?

• 74

• 71

• 86

• 65

• 70

If Jacob achieved scores of 12, 9, 7 and 12 on his last four language vocabulary tests, what score must he get on the fifth test to have a mean of 11?

• 16

• 14

• 11

• 13

• 15

This frequency histogram shows the times of finishers in a fun run.

What percentage of competitors finished in quicker than 40 minutes?

• 55%

• 85%

• 50%

• 62.5%

• 60%

What is the interquartile range of the set of ordered data below?

1.1 2.3 2.4 2.8 3.1 3.4 3.6 3.8 3.8 4.1 4.5 4.7 4.9

• 2–5

• 1.7

• 3.8

• 1.3

• 2.1

Choose the incorrect statement about the given box plot:

• The range is 36.

• Fifty per cent of values are between 36 and 51.

• The median is 42.

• Twenty-five per cent of values are below 36.

• The interquartile range is 20.