Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 110 minutes and a standard deviation of 15 minutes. What proportion of 1040R tax forms will be completed in less than 85 minutes? Round your answer to at least four decimal places.

Suppose that the time required to complete a 1040R tax form is normal distributed with a mean of 100 minutes and a standard deviation of 10 minutes. What proportion of 1040R tax forms will be completed in at least 99 minutes? Round your answer to at least four decimal places. 0 X Ś

Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 61 miles tickets for cars with speeds exceeding 80 The records show that exactly 1% of the speeds exceed this limit. Find the standard deviation of the speeds of hour cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. miles hour X miles hour 5 . The highway patrol's policy is to issue

the mean age at time of death in the US is 74.1 years and the standard deviation is 17.9 years At what age would you die, if only 1% of people die older than you?

The production of hybrid cars increased from $3.94 million in 2003 to $6.93 million in 2013. Calculate the average annual percent growth in the production of hybrid cars (use the geometric mean concept). Express your answer as a percentage rounded to two (2) decimal places.

A section of highway is posted with a 55 mph speed limit. In fact, speeds of cars traveling on this section are normally distributed with mean 58 mph and standard deviation 5 mph. If the state patrol decides to ticket cars in the fastest 10 %, at what speed will they start ticketing ? Round your answer to the first decimal position.

IF your mean is 832 and your standard deviation is 86, what values like in the 36% range?? How do you figure it out??

Assume that we have made 10 repeated measurements of a quantity, and as a result the error assigned to the “best estimate” of the mean is 6. If we then expand our data set to a total of 20 measurements, the error in the mean will reduce to just 3. True or False

Suppose that we doubled everyone's original salary what will happen to the mean and sd