on average Americans report spending $151 on food per week with a standard deviation of $11. If they are spending on food follows a normal distribution report an interval that falls with each percent

Question

68%

95%

99.7%

Answer 1

mean +/- 1 std dev falls within 68% = 151 +/- 11 = 140, 162

mean +/- 2 std dev falls within 95% = 151 +/- 2*11 = 129, 173

mean +/- 3 std dev falls within 99.7% = 151 +/- 3*11 = 118, 184