I need solve this questions

QUESTION 17 The daily sales of Hi-White toothpaste are believed to be approximately normally distributed. For a random sample of 21 days. the standard deviation sales turned out to be 18.44 tubes. Find the crtical value that corresponds to the condence interval if the margin of error is 7.02. Round your answer to m decimal places. QUESTION 18 Whenever the population has a normal distribution, the sampling distribution of the sample mean is normal for any sample size. only small sample sizes. only samples of size 30 or less. only large sample sizes. OUESTION19 Suppose the age of cars on the road is normally distributed with a mean of 9.4 years. If the standard deviation is known to be 2.2 years. what is the probability that 16 randomly selected cars have been on the road between 8 and 9 years? Round your answer to M decimal places. QUESTION 20 Assume that the time spent by students in extra curricular activities per week is normally distributed with a standard deviation of 13.87 hours. A random sample of 74 students is selected. Find the standard error of the sampling distribution of the sample mean time? Round your answer to mdeclmal places. QUESTION 21 The monthly salaries of employees of a construction company is normally distributed and averaged at AED 16.000 with a standard deviation of AED 2500. Find the minimum and the maximum salaries symmetrically distributed around the population mean, that will include 85% of the sample means X . based on samples of 25 employees. Round your answer to the nearest dlrham. QUESTION 22 A survey of 18 adults in UAE found that the mean age for a person's primary vehicle is 3.2 years and a standard deviation cl 0.? year. Assuming that the population is normally distributed. Find the lower condence Ilmit (LCL) of the 95% condence interval for the population mean age. Round your answer to dim declnal places