Plz help me on these 4 questions
1 answer:
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Answer: 0.0899.
Step-by-step explanation:
Given: CNNBC recently reported that the mean annual cost of auto insurance is 1048 dollars, the standard deviation is 282 dollars.
Sample size : n= 55
Let be the sample mean.
The probability that a sample of size n =55 is randomly selected with a mean less than 997 dollars:
Hence, the required probability = 0.0899 .