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Question 7 2.5 points Save Answer Use the 68-95-99.7 rule to solve the problem. Assume that a distribution has a mean of 21 and a standard deviation of 4. What percentage of the values in the distribution do we expect to fall between 17 and 217 17% 25% 68% 34%

Answer 1

for n=17 z = 2.7 Given: mean, u =21 standard deviation, o=4 ..2=4-4 » z = *-21 for 4=21 17-21 7 =- z=21-21=0 4 :.P( 17 < x <21)=P(-K Z<0) = 1/2 P(-1K 241) = 1/2 x 684 2 34 %. . The correct answer is 34% 34% Х 17 21 + - O Z Q.5. B À is the shaded region. (ie the region contained in U, but not in A) A {12,15,16,18,19} 12. IS 13 17 14 16. 19

Q.13. The luxury sales tax rate in a foreign country is 27%. A very wealthy socialite bought a diamond tiara for $ 175000. tax = 27% of 175000 = 27 -x175000=27x1750 247250 .. The correct answer is * $ 47,250 9.21. Given, mean u=29 Standard deviation, s=4 2= 2 = 24-29 o for n=29, z= 29-29=0 29 37 X - - 2. 2 0 for n=37 z=17-29 = 2 = 2 .. P(29<uq 37) = PlocI<2) = 1/2 XP(-2<2<2) = 12 x 95%= 47.54 :. The correct answer is m 47.51%