JEE PYQ: Statistics Question 13
Question 13 - 2020 (04 Sep Shift 2)
If a variance of the following frequency distribution:
| Class | 10-20 | 20-30 | 30-40 |
|---|---|---|---|
| Frequency | 2 | $x$ | 2 |
is 50, then $x$ is equal to ____.
Show Answer
Answer: 4
Solution
$\frac{2900+625x}{4+x} = 675$, $50x = 200$, $x = 4$.