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Chapter 2: Problem 18

Which of the following statements contain exact numbers? a. There are 12 eggs in a dozen. b. Some Major League Baseball pitchers can throw a ball over 140 \(\mathrm{km} / \mathrm{h}\) . c. The accident injured 21 people. d. The circumference of the Earth at the equator is 40000 \(\mathrm{km} .\)

Short Answer

Expert verified
The statements a 'There are 12 eggs in a dozen' and c 'The accident injured 21 people' contain exact numbers. The others don't as they contain measured numbers.

Step by step solution

01

Identify Exact Numbers in Statement a

The statement reads 'There are 12 eggs in a dozen'. A 'dozen' is a defined amount which is exactly 12. So, 12 in this context is an exact number.
02

Identify Exact Numbers in Statement b

The statement reads 'Some Major League Baseball pitchers can throw a ball over 140 km/h'. Here, the value 140 km/h is a measured value which may vary from pitcher to pitcher. So, this is not an exact number.
03

Identify Exact Numbers in Statement c

The statement reads 'The accident injured 21 people'. Here, 21 represents the number of people, so it is a counted or exact number.
04

Identify Exact Numbers in Statement d

The statement reads 'The circumference of the Earth at the equator is 40000 km'. This value is a widely accepted scientific value and can vary depending on the measurement accuracy. So, it is not an exact number.

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