In a certain breed of cattle, the length of gestation has a mean of 284 days and a standard deviation is 5 point 5 days. What is the z -score for a gestation period that lasts 290 days?
Answer
A
negative 1 point 0 0
B
1 point 0 0
C
1 point 0 9
D
negative 1 point 0 9
Explanation
Use the z-score formula: z = (value − mean) ÷ standard deviation. For a 290-day gestation, z = (290 − 284) ÷ 5.5 = 6 ÷ 5.5 ≈ 1.09. The correct choice is 1 point 0 9.
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