A survey regarding the heights (in cm) of 51 girls of Class X of a school was conducted and data was obtained as shown in table. Find their median

A survery regarding the heights (in cm ) of 51 girls of Class X of a school was conducted and date was obtained as shown in table . Find their median . {:("Height (in cm)","Number of girls"),("Less than"140,4),("Less than"145,11),("Less than"150,29),("Less than"155,40),("Less than"160,46),("Less than"165,51):}

The heights of boys and girls of IX class of a school are given below. Compare the heights of the boys and girls.

In the adjacent figure, the height of a solid cylinder is 10 cm and diameter is 7 cm. Two equal conical holes of radius 3 cm and height 4 cm are cut off as shown in the figure. Find the volume of the remaining solid.

The marks obtained in mathematics by 30 students of Class X of a certain school are given in table the below. Find the mean of the marks obtained by the students.

Let U be universal set of all the students of Class XI of a coeducational school and A be the set of all girls in Class XI. Find A′.