The length of time it takes to find a parking space at 9 A. M. follows a normal distribution with a mean of 6 minutes and a standard deviation of 3 minutes. Eighty percent of the time, it takes more than how many minutes to find a parking space

And if we solve for a we got

Eighty percent of the time, it takes more than 8.526 how many minutes to find a parking space

Step-by-step explanation:

Let X the random variable that represent the lenght of time it takes to find a parking space of a population, and for this case we know the distribution for X is given by:

Where and

For this part we want to find a value a, such that we satisfy this condition:

  (a)

  (b)

We want to find a value who accumulate 0.80 of the area on the left and 0.2 of the area on the right it's z=0.842.

If we use condition (b) from previous we have this:

Using this formula we have:

And if we solve for a we got

Eighty percent of the time, it takes more than 8.526 how many minutes to find a parking space

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.