Given Information:
- Mean pocket allowance of children in a locality is Rs 18.

Missing Frequency:
We need to find the missing frequency in the given distribution.

Steps to Find the Missing Frequency:

1. Identify the Known Frequencies:
- We are given a distribution that shows the daily pocket allowance of children.
- The mean pocket allowance is Rs 18.
- Let's denote the missing frequency as 'x'.

2. Find the Sum of the Known Frequencies:
- To find the missing frequency, we need to calculate the sum of the known frequencies.
- Sum of the known frequencies = (Frequency 1) + (Frequency 2) + (Frequency 3) + ... + (Frequency n)

3. Find the Total Number of Observations:
- The total number of observations is the sum of the known frequencies plus the missing frequency.
- Total number of observations = Sum of the known frequencies + Missing frequency = (Frequency 1) + (Frequency 2) + (Frequency 3) + ... + (Frequency n) + x

4. Find the Sum of the Pocket Allowances:
- The sum of the pocket allowances is calculated by multiplying each pocket allowance with its corresponding frequency and then summing them up.
- Sum of pocket allowances = (Pocket allowance 1 * Frequency 1) + (Pocket allowance 2 * Frequency 2) + (Pocket allowance 3 * Frequency 3) + ... + (Pocket allowance n * Frequency n)

5. Use the Formula for Mean:
- The formula for the mean is given by: Mean = Sum of pocket allowances / Total number of observations
- Substituting the given values, we have: 18 = Sum of pocket allowances / (Sum of the known frequencies + Missing frequency)

6. Solve for the Missing Frequency:
- Rearranging the formula, we can solve for the missing frequency.
- Missing frequency = (Sum of pocket allowances) - (Mean * Total number of observations)

7. Calculate the Missing Frequency:
- Substitute the values into the formula and calculate the missing frequency.

Conclusion:
By following the above steps, we can find the missing frequency in the given distribution by using the formula for the mean.

Where is your frequency table check your question is incomplete