If the mean lifetime is actually 31 years, what is the probability we will reject the null hypothesis at a 0.05 significance level?

Need answers and explanation on question 2

Questions 7-11. An online poll of 810 adults found that 53% of the respondents think critical thinking should be taught in schools. What is the population represented here? all adults 810 adults polled respondents who think critical thinking should be taught in schools 53%

The question was meant to be x to the 7 halves

The answers was incorrect

The first part to find (a.) was right, but the next part (b.) was marked wrong.

Question D and E were not answered.

It is the same question