A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.6 years, and standard deviation of 0.5 years. If 22 items are picked at random, 5% of the time their mean life will be less than how many years?

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6