Answer:
The sound level of 41 singers is approximately 79.52 dB.
Explanation:
As the sound level is given as 63.4 dB
The Intensity to Sound level relation is given as

Here β is given as 63.4 dB
I is to be calculated for 1 singer
I_o is constant as 10⁻¹²
So the equation is given as

Now as there are 41 singers so their I is given as

Now the value of sound level is given as

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Explanation:
It's both a solid and a liquid. It can thicken and soften depending on how it's handled.