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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Verbal Ability | 34% | - Reading Comprehension
|
| Topic 2: Science | 38% | - Human Anatomy & Physiology
|
| Topic 3: Mathematics | 28% | - Data & Information
|
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NEW QUESTION # 48
Five samples were taken of a population of four-year-old children.
The table shows the sample sizes and mean heights (cm):
Based on these samples, what is the mean height of the population of four-year-old children?
Answer: D
Explanation:
This question tests weighted averages. Because the sample sizes are different, you cannot simply average the mean heights. Instead, multiply each sample mean by its sample size, add the results, and divide by the total number of children.
Total children = 20 + 20 + 25 + 70 + 20 = 155
Total height = (20×95) + (20×100) + (25×100) + (70×110) + (20×105)
= 1,900 + 2,000 + 2,500 + 7,700 + 2,100
= 16,200
Mean height = 16,200 ÷ 155 # 104.5 cm
Therefore, option A is correct. The NEX exam frequently tests understanding that larger samples should carry more weight when calculating population estimates.
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NEW QUESTION # 49
In which biochemical family do starch and glycogen belong?
Answer: C
Explanation:
Starch and glycogen are both polysaccharides, which are complex carbohydrates composed of many glucose units. Starch is the primary storage form of glucose in plants, while glycogen is the storage form of glucose in animals, particularly in the liver and muscles. Carbohydrates serve as a major energy source for cells. Nucleic acids store genetic information, proteins perform structural and enzymatic functions, and lipids are involved in energy storage and membrane structure. The NEX Science exam often tests classification of biomolecules and their functions, making carbohydrates the correct answer.
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NEW QUESTION # 50
What is the term used to describe random changes in DNA, which may be silent, negative, or positive, to the organism in which they occur?
Answer: C
Explanation:
A mutation is a random change in the DNA sequence of an organism. Mutations can occur due to errors during DNA replication, exposure to radiation, or chemical agents. These changes may have no effect (silent mutations), cause harm (negative mutations), or provide an advantage (positive mutations). Recombination refers to the exchange of genetic material during meiosis, not random DNA changes. Duplication involves copying a segment of DNA, and replication is the normal process of copying DNA before cell division. The NEX Science exam often emphasizes that mutations are a source of genetic variation and can influence evolution and disease. Understanding the different possible effects of mutations is essential for topics related to genetics, cancer biology, and inheritance.
NEW QUESTION # 51
A hospital spends $364,468 per year (52 weeks) on electricity. On average, how much does it spend per week on electricity?
Answer: D
Explanation:
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.
NEW QUESTION # 52
A financial counselor is reviewing the annual tax refunds received by a group of clients. The refunds are shown below:
$500, $857, $1,500, $500, $6,753, $2,500, $3,000
What is the median tax refund?
Answer: A
Explanation:
This question assesses understanding of the median, which is the middle value when data are ordered from least to greatest. First, list the refunds in ascending order:
$500, $500, $857, $1,500, $2,500, $3,000, $6,753.
There are seven values total, so the median is the fourth value in the ordered list. The fourth value is $1,500.
Therefore, option D is correct. Option B represents the mode (most frequent value), not the median. Options A and C are averages or midpoints that do not correspond to the true median position. On the NEX exam, students are frequently tested on distinguishing mean, median, and mode, so remembering that the median is strictly positional-not calculated-is essential.
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NEW QUESTION # 53
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