The mean high temperature of the first four days of a week is 25 whereas the mean of the last four days is 25.5 if the mean of the whole week is 25.2 , then the temperature of the 4^{th} day is

(a) 25.2 (b) 25.5 (c) 25.6 (d) 25

The mean high temperature of the first four days of a week is 25 whereas the mean of the last four days is 25.5 if the mean of the whole week is 25.2 , then the temperature of the 4^{th} day is

(a) 25.2 (b) 25.5 (c) 25.6 (d) 25

1 Answer

127 votes

Average temperature of first four days = 25

Total temperature of first four days = 25

Average temperature of last four days = 25

Total temperature of last four days = 25.5

Total temperature of whole week = 25.5

∴ Temperature of the 4^{th} day = 100

127 votes

127