naplan_year9_test_prep_set7

The number of people waiting at the checkouts in a supermarket is counted once every hour. The results on Saturday were 4, 2, 11, 16, 14, 11, 5, 12, 6, 9. Which of these statements is correct?

• The mean is 9 and the median is 10.
• The median is 9 and the mode is 11.
• The median is 11 and the mean is 9.
• The mode is 11 and the median is 14.

At the start of 2009 the world price of sugar was 14 cents per pound. (A pound is a unit of weight - there are 2.2 pounds in a kilogram.) The world price of sugar rose by 60% during 2009. Which calculation gives the world price of sugar per kilogram at the end of 2009?

• 14 x 0.6 ÷ 2.2
• 14 x 1.6 x 2.2
• 14 x 0.6 x 2.2 + 14
• (14 x 0.6 + 14) ÷ 2.2

5 2/3 is very close to the cube root of a whole number. What is this number? 

• 179
• 181
• 182
• 185

An octahedral die has its faces numbered from 1 to 8. What is the probability of rolling a number less than 6 with this die?

• 1/8
• 1/6
• 5/8
• 3/4

The value of a variable, k, is tripled and the result is then squared. Which one of these expressions is correct?

• √3k
• 3k²
• √3k
• 9k²

The rim of a round mug with a radius of 4 cm has a blue stripe painted around it. What is the length of the blue stripe (to the nearest centimetre)?

• 20 cm
• 21 cm
• 22 cm
• 25 cm

The number of particles in the universe was estimated by one scientist to be 34⁵⁶. Which of these numbers is equal to 34⁵⁶.

• (34⁵⁰)⁶
• 34⁵⁰ + 34⁶
• 30⁵⁶ x 4⁵⁶
• 2⁵⁶ x 17⁵⁶

If x, y and z are positive numbers and x < y < z, which one of these statements is always true?

• x/y < y/z
• y/z < y/x
• x + y < z
• y < x - z