Estimate the number of hairs on your scalp

Updated: Nov 18

Mobiprep has created step by step solution to estimation questions for all product management and consulting interview questions to help you with the mastering placement interviews. So let’s get started with the estimation questions.

  1. Estimate the total number of light bulbs currently used in Delhi

  2. Estimate the number of hairs on your scalp

  3. Estimate the annual size of sport shoes in India

  4. Estimate the number of Golf ball that can fit in the room

  5. Estimate the number of Dogs in Delhi

  6. Number of Paracetamol tablets sold in Delhi

  7. Estimate the length of roads in Delhi

  8. Estimate the number of lakes in the world

  9. Estimate the number of hospitals in Delhi


Our team has curated a list of the most important product management frameworks asked in interviews such as Google, Deloitte, McKinsey, Microsoft, EY, ZS and many more. The frameworks are created from the best practices adopted by previous year candidates.

  1. Product Management: 4P's of Marketing

  2. Product Management: SWOT Analysis

  3. Product Management: AIDA Framework

  4. Product Management: Porter's Five Forces


In this estimation question we have analysed the market size of the number of hairs on your scalp. Check out the step-by-step answer created by Mobiprep experts.


Estimation Question Step-1: Segmentation

Approach:

Estimate area of the head

Estimation Question Step-2: Solution


i) Head to be rectangular

Now, assuming that 80% of the scalp is covered by hair.

We have,

80% of 150 sq. cm = 120 sq. cm


Assuming, the thickness of the hair to be 1 mm or 0.1 cm

So, for total no. of hairs on scalp

= 120/0.1 = 1200 hairs


ii) Head to be curved

Now, assuming that 80% of the scalp is covered by hair.

We have,

80% of 157 sq. cm = 125.6 sq. cm


Assuming, the thickness of the hair to be 1 mm or 0.1 cm

So, for total no. of hairs on scalp

= 126/0.1 = 1260 hairs






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