ATAR Calculation Fundamentals 2

Question 1

A student scores 72, 85, 91, 68, and 79 on five tests. What is the mean score?

Accepted Answer

79.0

Answer

Mean = (72+85+91+68+79)/5 = 395/5 = 79.0.

Question 2

What is 3/8 expressed as a decimal?

Accepted Answer

0.375

Answer

3 ÷ 8 = 0.375.

Question 3

If a car travels 240 km in 3 hours, what is its average speed in km/h?

Accepted Answer

80 km/h

Answer

Speed = distance ÷ time = 240 ÷ 3 = 80 km/h.

Question 4

Which of the following is equivalent to 2^5 × 2^3?

Accepted Answer

2^8

Answer

When multiplying powers with the same base, add exponents: 2^(5+3) = 2^8.

Question 5

A rectangle has a length of 12 cm and a width of 7 cm. What is its perimeter?

Accepted Answer

38 cm

Answer

Perimeter = 2(length + width) = 2(12+7) = 2×19 = 38 cm.

(ATAR) Australian Tertiary Admission Rank Practice Test