Answer :
Answer: 10.5
With out being rounded it’s 10.5417
Step-by-step explanation:
As per linear equation, the mean lifespan of 60 glow worms is 10.5 months.
What is a linear equation?
A linear equation is an equation that contains one or multiple variable with the highest power of the variable is one.
Given, 20 of them live for 10 months, 15 of them live for 10.5 months, and 25 of them live for 11 months.
Therefore, total life of 60 glow worms is
= (20 × 10 + 15 × 10.5 + 25 × 11) months
= 632.5 months
Therefore, the mean lifespan of 60 glow worms is
= 632.5/60 months
= 10.54 months
≈ 10.5 months
Learn more about linear equation here: https://brainly.com/question/11445304
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