The average weight of a newborn infant is 2.7 kg.An infant that weighs 3.15 kg has a z-score of 1.Find the standard deviation.
A)0.05 kg
B)0.14 kg
C)1.35 kg
D)0.45 kg
E)2.7 kg

Question

Quizplus · Accepted Answer

The z-score formula is Z = (X - μ) / σ, where Z is the z-score, X is the value, μ is the mean, and σ is the standard deviation. Plugging in the given values: 1 = (3.15 - 2.7) / σ. Solving for σ gives σ = 0.45 kg.

The Average Weight of a Newborn Infant Is 2