A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1540 and the standard deviation was 311. The test scores of four students selected at random are 1920, 1300, 2240, and 1420. Find the Z-scores that correspond to each value and determine whether any of the values are unusual.

x/3-10=8

x/3=18

x=48

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .