Looking at 1) first, do you know how to use tables or computer software to do this? (You won't be able to do it by hand effectively).
I got two problems that are statistics.
Find a value of the standard normal random variable z, called Z0 such that P(-Z0 ≤ Z ≤ Z0) = 0.98
The time for the event for boys in secondary school is known to possess a normal distribution with a mean of 470 seconds and a standard deviation of 60 seconds. The fitness association wants to recognize the fastest 10% of the boys with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association?
If someone could please help that would be greatly appreciated.
i figured out the first one but i cannot figure out the second one. but to answer your question i know how to use tables.
i got a few more questions if you can please help me:
the amount of soda a dispensing machine pours into 12-ounce can of soda follows a normal distribution with a standard deviation of 0.16 ounce. Every can that has more than 12.40 ounces of soda poured into it causes a spill and the can must go through a special cleaning process before it can be sold. What is the mean amount of soda the machine should dispense if the company wants to limit the percentage that must be cleaned because of spillage to 3%?
Transportation officials tell us that 70% of drivers wear seat belts while driving. Find the probability that more than 579 drivers in a sample of 800 drivers wear seat belts.