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Estimate the number of hairs on your scalp

Updated: Nov 18, 2022

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.


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.


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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hp ms
Nov 03, 2022

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