Ian's Tree Farm Grows Spruce Trees for Nurseries

question 13

Multiple Choice

Ian's Tree Farm grows spruce trees for nurseries. The average annual increase in tree diameter is 7.9 centimetres with a standard deviation of 1.3 centimetres. A random sample of n = 50 trees is collected. What is the probability of the sample mean being less the 7.4 centimetres?

• A) 0.0033
• B) 0.4977
• C) 0.5023
• D) 0.9977
• E) 0.9954

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