The daily minimum temperature of a place in a certain week. begining from Monday was 20°, 18.6°, 17°, 21.4°, 19° and 19.8°. It was known that the average of whole week was 19.5°. The minimum temperature on Sunday was?
Correct Answer: 20.7°
Explanation:
Let temperature on sunday be x° C.
(20° + 18.6° + 17° + 21.4° + 19° + 19.8° + x) / 7 = 19.5°
⇒ 115.8 + x = 19.5 x 7
⇒ x = 136.5 - 11.58
⇒ x = 20.7°C
