EXERCISE 1C

The maximum temperature (in the Celsius scale) of New Delhi for the seven days of a week in the month of April 2015 are $40.2°, 39.3°, 39.4°, 39.6°, 40.1°, 40° \mathrm{and} 39.3°$ respectively. Find the mean of all these maximum temperature in degree.

The mean weight of $4$ persons is $75 \mathrm{kg}$. Find the total weight in form of $kg$.

Some students contributed a total of $5412$ to a relief fund. If the mean contribution per student was $132$, find the number of students.

The mean of two numbers is $13$. If one of them is $20$, find the other 

The mean of three numbers is $19$. If two of them are $10$ and $15$, find the third number

The mean of $3, 8, 15, x and 14 is 12$. Find x.

The mean of $5, 11, 17, x, 25, 118 and 400 is 103$. Find x

^{The mean height of four boys is $145 \mathrm{cm}$. If the heights of three of them are $150 \mathrm{cm}$, $142 \mathrm{cm}$ and $146 \mathrm{cm}$, find the height of the fourth boy in $cm$.}