The mean wage per hour for all 4000 employees working at a large company is RM 10.50 with a standard deviation of RM 5.30. Let x be the mean wage per hour for a random sample of certain employees...

Extracted text: The mean wage per hour for all 4000 employees working at a large company is RM 10.50 with a standard deviation of RM 5.30. Let x be the mean wage per hour for a random sample of certain employees selected from this company.


Extracted text: U-shop sells a certain grade of manila card where the thickness is normally distributed with mean 7.3mm and variance 0.25mm. Find the probability: i. of manila card greater than 7.1mm thick. ii. of manila card will be between 7mm and 8mm thick? iI. the percentage of your answer in Question 4b (ii).