Let XXX be the CNG use rate: X∼N(μ,σ2)X\sim N(\mu, \sigma^2)X∼N(μ,σ2)
Then Z=X−μσ∼N(0,1)Z=\dfrac{X-\mu}{\sigma}\sim N(0, 1)Z=σX−μ∼N(0,1)
Given μ=25.5,σ=4.5\mu=25.5, \sigma=4.5μ=25.5,σ=4.5
The CNG use rate for the new car must be 32.9 km/ kg
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