Answer:
A
The test statistics is
B
The Null and Alternative hypothesis are
and
Step-by-step explanation:
From the question we are told that
The population mean is
The sample size is
The sample mean is
The sample standard deviation is
The level of significance is
Given that the value which the manufacturer gave the automobile is 47.2 and it is believed that this is not correct, then
The Null Hypothesis is
The alternative Hypothesis is
The test statistics can be mathematically evaluated as
substituting values