O P Malhotra, S K Gupta and, Anubhuti Gangal Solutions for Chapter: Frequency Distribution and Mean, Exercise 2: Exercise

Arun and deepak sat for six tests. Their percentage scores were:

Who has higher mean score.

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133.$

What is the height of the tallest girl?

Renu scored $73, 86, 78$and $75$ marks in four tests. What is the least number of marks she can score in her next test, if she has to have a mean score of minimum $80$ marks in five tests?

Find the mean of the following frequency distributions: (Use the formula mean = $\frac{\sum _{}fx}{\sum _{}f}$)

Find the mean of the following marks obtained by students of a class.

Find the mean of the following data:

The marks scored in a test by a class of $25$ boys are as follows:

$$\begin{gathered} 24, 25, 23, 20, 20, 19, \\ 23, 20, 24, 22, 18, 23, \\ 23, 18, 20, 16, 25, 24, \\ 17, 18, 23, 22, 23, 20, 24 \end{gathered}$$

Find the mean marks of the class.

The mean weight of sample of $10$ oranges is $34 \mathrm{g}$.  Later it was shown that the weighing machine had shown the weight of each orange is $5 \mathrm{g}$ less. Find the correct mean weight of oranges.