Data Analysis, SM-Bank 049

Evie made a dot plot to show the distances she has swum in her training for a long distance ocean swim.

What is the mean distance that Evie has swum? Give your answer correct to 1 decimal place. (2 marks)

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\(21.6\ \text{km}\)

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\(\text{Mean}\ \)	\(=\dfrac{\text{Sum of the scores}}{\text{Number of scores}}\)
	\(=\dfrac{18+19+2\times 20+2\times 21+22+3\times 24+25}{11}\)
	\(=\dfrac{238}{11}=21.636\dots\)
	\(\approx 21.6\ \text{km (1 d.p.)}\)