Answer: The null and the alternative hypotheses are given below:


Under null hypothesis, the test statistic is:




Now we have to find the left tailed critical value at 0.01 significance level using the standard normal table.
The critical value is:

Since the test statistic is -0.26 lies in acceptance region because the critical region is beyond -2.33, therefore, we fail to reject the null hypothesis.
9/-5 ÷ -3/8 = 9/5 ÷ 3/8 = 27/8/5= [8•5=40] = 27/40
Answer: 27/40
Use -a/b= a/-b= a/b to rewrite the
fraction. -
Simplify the complex fraction
Simplify the complex fraction( yes again)