According to the Internal Revenue Service, the average length of time for an individual to complete (keep records for, learn, prepare, copy, assemble, and send) IRS Form 1040 is 10.12 hours (without any attached schedules). The distribution is unknown. Let us assume that the standard deviation is three hours. Suppose we randomly sample 36 taxpayers. Give the distribution of X. Find the probability that the 36 taxpayers took an average of more than 12 hours to finish their Form 1040s.

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step-by-step explanation:

answer is  

d.

3.09

hope you got this right.

option a is correct.

only one solution to the system of equations

step-by-step explanation:

if the graph of the equations do not intersects(i.,e if they are parallel) then, there are no solutions that are true for both the equations.

if the graph of the equations intersects, then there is one solution and that is true for both the equations.

since, in the given figure:

the two lines intersect each other

⇒there is only one solution which satisfy both the lines of an equations.

therefore, there is only one solution to the system of equation