Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find Upper P 40, which is the IQ score separating the bottom 40% from the top 60%. Round your answer to nearest tenth.

And if we solve for a we got

And for this case the value would be 96.2 for the P40

Step-by-step explanation:

Let X the random variable that represent the IQ scores of a population, and for this case we know the distribution for X is given by:

Where and

We want to find the P40 ( a) so we need to satisfy the following condition:

  (a)

  (b)

For this case we can look for the critical value in the normal standar ddistirbution who accumulate 0.4 of the area in the left and 0.6 in the right and we got z=-0.253.

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

And we can set up the following equationL

And if we solve for a we got

And for this case the value would be 96.2 for the P40

72 fudge and 75 toffee

step-by-step explanation:

i hope this : )

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.