A swimming academy has student members of various ages. Student distribution according to age is given below. What is the total number of student members in the academy?

$\begin{matrix} S t u d e n t a g e i n t e r v a l & N u m b e r o f s t u d e n t 8 - 10 & 7 10 - 12 & 10 12 - 14 & 9 14 - 16 & 13 16 - 18 & 11 18 - 20 & 2 \end{matrix}$

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Solution

In above table, the right column with number of student in each age group is a frequency table. The total number of student is the sum of number of student of each group, which is the sum of all elements in frequency table. Frequency is denoted by (f), the sum is denoted by ( $\sum$ f).

The sum of all elements of right column is 52.

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A swimming academy has student members of various ages. Student distribution according to age is given below. What is the total number of student members in the academy? ___

$\begin{matrix} S t u d e n t a g e i n t e r v a l & N u m b e r o f s t u d e n t 8 - 10 & 7 10 - 12 & 10 12 - 14 & 9 14 - 16 & 13 16 - 18 & 11 18 - 20 & 2 \end{matrix}$

Q. In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is

\frac{2}{3}

of the number of students of 8 years of age which is 48. What is the total number of students in the school?

In a certain school, 20% of students are below 8 years of age. If the number of students whose ages are equal to or greater than 8 years of age is 96, what is the total number of students in the school?

Modal age of students in given distribution is

The total number of girl students is what percentage of the total number of staff members in the school?

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A swimming academy has student members of various ages. Student distribution according to age is given below. What is the total number of student members in the academy? Student age interval Number of student 8−10710−121012−14914−161316−181118−202 ___