A research council wants to estimate the mean length of time the average US adult spends watching TV using digital video recorders (DVR) each day. The council took a sample of 20 US adults and found the mean to be 15.1 minutes. If the mean amount of time is between 14.62 and 15.58 minutes with a standard deviation of 1.3 minutes, which approximate confidence level does the range represent?

Evaluate the following expression 1/3^2

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?

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out