In a normal distribution what percent of values fall within one standard deviation of the mean?
19.1%
15%
30%
68.2%

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?