In a month, the 4 windy days had a mean highest temperature of 18 °C and the 16 calm days 22 °C. What is the mean of all 20 days?

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In a month, the 4 windy days had a mean highest temperature of $18\ ^\circ\text{C}$ and the 16 calm days $22\ ^\circ\text{C}$ . What is the mean of all 20 days?

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