340 is (340-380)/20=-2, or 2 standard deviations below the mean.
420 is (420-380)/20=2, or 2 standard deviations below the mean.
95% of values lie within 2 standard deviations of the mean, so the answer is 95%.
Answer:
Step-by-step explanation:7/10 is the answer
I believe that the amount of the instant rebate is $30. X represents the price of the bike, 0.09 is the sales tax.
So if the bike cost $100:
0.09(100) + (100-30) = 9 + 70 = $79
Although I think I would want them to tax the bike after the instant rebate and not on the original price.
If I'm wrong about the instant rebate then it would be 1.09x-30. Hope this helps.