Grouping data - class-X
Tally marks are used find
Satish got the following marks in his weekly class tests out of $50$:
$48$, $32$, $36$, $42$, $38$, $35$, $39$, $49$, $34$, $14$, $32$, $37$, $31$ What should he expect in the next weekly test out of the following?
(i) between $40 - 50$
(ii) between $30 - 40$
| 12 | 24 | 36 | 48 | 60 | 72 |
|---|---|---|---|---|---|
| 24 | 48 | 60 | 72 | 50 | 30 |
| 50 | 45 | 50 | 75 | 50 | 34 |
The number of students in a quiz competition scores are in the table. How many students scored $50$ marks?
Consider the following frequency distribution:
| Class | $0-10$ | $0-20$ | $0-30$ | $0-40$ | $0-50$ |
|---|---|---|---|---|---|
| Frequency | $3$ | $8$ | $14$ | $20$ | $25$ |
What is the above frequency distribution known as?
Consider the following statements :
1. A continuous random variable can take all values in an interval.
2. A random variable which takes a finite number of values is necessarily discrete.
3. Construction of a frequency distribution is based on data which are discrete.
Which of the above statements are correct ?
The marks (out of 10) obtained by 28 students in a Mathematics test are listed as below :
8, 1, 2, 6, 5, 5, 5, 0, 1, 9, 7, 8, 0, 5, 8, 3, 0, 8, 10, 10, 3, 4, 8, 7, 8, 9, 2, 0
The number of students who obtained marks more than or equal to 5 is
The frequency distribution of marks obtained by $60$ students of a class is given.
| X | $30-34$ | $40-44$ | $45-49$ | $50-54$ | $55-59$ | $60-64$ |
|---|---|---|---|---|---|---|
| f | $3$ | $5$ | $12$ | $18$ | $14$ | $62$ |
Find mode of the distribution.
The median and mode of frequency distribution are 525 and 500, then mean of same frequency distribution is -
Mode of distribution
$Marks\begin{bmatrix} 4 & 5 & 6 & 7 & 8 \end{bmatrix}\ No\quad of\quad students\quad \begin{bmatrix} 3 & 5 & 10 & 6 & 1 \end{bmatrix}$
The cumulative frequency distribution corresponding to 20 percentile is ______.
Find a 9596 confidence interval for the population mean from the following data:
Sample size n = 65, Mean = 6300, Standard deviation = 9.5, N=1000.
What are the shortcomings of frequency distribution?
If $y \, = \, x^3 \, + \, 40$, find $\displaystyle \frac{d^2y}{dx^2} =$____.
A tabular summary of a set of data showing classes of the data and the fraction of the items belonging to each class is called ______________.
In a truly normal frequency distribution _________.