According to u. s. census bureau figures, 35.3% of all americans are in the 0-24 age bracket, 14.2% are in the 25-34 age bracket, 16.0% are in the 35-44 age bracket, and 34.5 are in the 45 and older age bracket.
a study by jupiter media metrix determined that americans use their leisure time in different ways according to age.

for example, of those who are in the 45 and older age bracket, 39% read a book or a magazine more than 10 hours per week. of those who are in the 0-24 age bracket, only 11% read a book or a magazine more than 10 hours per week.
the percentage figures for reading a book or a magazine for more than 10 hours per week are 24% for the 25-34 age bracket and 27% the 35-44 age bracket. suppose an american is randomly selected and it is determined that he or she reads a book or a magazine more than 10 hours per week.
revise the probabilities that he or she is in any given age category. using these figures, what is the overall percentage of the u. s. population that reads a book or a magazine more than 10 hours per week?

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step-by-step explanation:

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when functions are first introduced, you will probably have some simplistic "functions" and relations to deal with, usually being just sets of points. these won't be terribly useful or interesting functions and relations, but your text wants you to get the idea of what the domain and range of a function are. small sets of points are generally the simplest sorts of relations, so your book starts with those.

step-by-step explanation:

state the domain and range of the following relation. is the relation a function?

{(2, –3), (4, 6), (3, –1), (6, 6), (2, 3)}

the above list of points, being a relationship between certain x's and certain y's, is a relation. the domain is all the x-values, and the range is all the y-values. to give the domain and the range, i just list the values without duplication:

domain: {2, 3, 4, 6}

range: {–3, –1, 3, 6}

(it is customary to list these values in numerical order, but it is not required. sets are called "unordered lists", so you can list the numbers in any order you feel like. just don't duplicate: technically, repetitions are okay in sets, but most instructors would count off for this.)

while the given set does indeed represent a relation (because x's and y's are being related to each other), the set they gave me contains two points with the same x-value: (2, –3) and (2, 3). since x = 2 gives me two possible destinations (that is, two possible y-values), then this relation is not a function.

note that all i had to do to check whether the relation was a function was to look for duplicate x-values. if you find any duplicate x-values, then the different y-values mean that you do not have a function. remember: for a relation to be a function, each x-value has to go to one, and only one, y-value.

state the domain and range of the following relation. is the relation a function?

{(–3, 5), (–2, 5), (–1, 5), (0, 5), (1, 5), (2, 5)}

i'll just list the x-values for the domain and the y-values for the range:

answer: none of these answers are correct only the second half is

step-by-step explanation: