Solve the questions.Kindly answer in English I don't understand swahili

Differentiate between each of the following types of sets.

• A finite set is a set whose elements can be counted, and the counting process eventually ends. It has a definite, limited number of elements.
• An infinite set is a set whose elements cannot be counted, as the counting process would never end. It has an unlimited number of elements.

• An empty set (or null set) is a set that contains no elements. It is denoted by $\emptyset$ or {}.
• A universal set is a set that contains all elements relevant to a particular context or problem. It is usually denoted by $U$.

Calculate the harmonic mean, mode, and median for the given data.

First, we prepare a table with midpoints ($x$), frequencies ($f$), $1/x$, $f/x$, and cumulative frequencies ($cf$).

The formula for the harmonic mean for grouped data is:

The formula for the mode for grouped data is:

The modal class is 40 - 50 (highest frequency, $f_m = 45$).
$L = 40$ (lower boundary of the modal class)
$f_m = 45$ (frequency of the modal class)
$f_1 = 25$ (frequency of the preceding class, 30 - 40)
$f_2 = 32$ (frequency of the succeeding class, 50 - 60)
$h = 10$ (class width)

The formula for the median for grouped data is:

First, find the median position: $\frac{N}{2} = \frac{150}{2} = 75$.
The median class is 40 - 50 (where the 75th observation falls, as $cf$ goes from 49 to 94).
$L = 40$ (lower boundary of the median class)
$N = 150$ (total frequency)
$cf_b = 49$ (cumulative frequency of the class before the median class)
$f_m = 45$ (frequency of the median class)
$h = 10$ (class width)