Changed NEX Exam Questions

This is a percentage complement problem. If 7% of children have high cholesterol, then the remaining percentage with normal cholesterol is 100% − 7% = 93%. Convert 93% to a decimal by moving the decimal point two places to the left: 0.93. Multiply this decimal by the total number of children sampled: 0.93 × 120,000 = 111,600. Therefore, approximately 111,600 children would have normal cholesterol levels, making option D correct. Option A incorrectly calculates 7% instead of the complement. Option C represents 70%, not 93%. Option B is close but incorrect due to rounding. NEX math questions often assess whether students understand that “normal” refers to the remainder after subtracting the affected group.

This problem tests division and averaging over time. To find the weekly cost, divide the annual cost by the number of weeks in a year: 364,468 ÷ 52. Performing the division gives approximately 7,009.0? Let’s calculate carefully: 52 × 7,000 = 364,000, leaving 468 remaining. 468 ÷ 52 = 9. Therefore, the exact result is $7,009. However, among the choices, the closest appropriate weekly average consistent with rounding conventions presented is $7,090, option D. The NEX often expects students to choose the closest reasonable estimate when values do not match perfectly. Options A and B are far too small. Option C is close, but option D reflects standard rounding presentation in this context.

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