5.7 kilometers is equal to 3.5418157957528034 miles
Technically all 3 of those would be correct answers. But applying the brakes would probably be the correct answer if all of the above isn't a answer.
Given that:
μ = 36
<span>σ = 3
</span>
<span>Standardize x to z = (x - μ) / σ </span>
<span>P( 39 < x < 42) = P[( 39 - 36) / 3 < Z < ( 42 - 36) / 3] </span>
<span>P( 1 < Z < 2) = P( x < 2) - P( x < 1)
= 0.9772 - 0.8413
= 0.1359 </span>
<span>(0.1359)(30)
= 4.0777
= 4 days</span>
