The wechsler adult intelligence scale (iq test) is constructed so that full scale iq scores follow a normal distribution, with a mean of 100, and a standard deviation of 15. the mayor of smart town believes the county's residents are smarter than the national average and wants to use it (the intelligence of the residents) as a marketing tool to bring industries to the area. a researcher is hired to conduct a study to determine whether smart county's residents have, on average, higher full scale iqs than the population. a random sample of 100 people from smart county were given the iq test and were found to have an average full scale iq of 105. which hypothesis test should be used to determine whether the mean full scale iq score of the smart county residents is higher than the national average?

third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200