Correct Answer: B. digital

Correct Answer: A. 8.25

Explanation

Mean \(\bar{x}\) = \(\frac{3 + 7 + 6 + 2 + 8 + 5 + 9 + 1 + 4 + 10}{10} \)

= \(\frac{55}{10} = 5.50\)

Variance = \(\frac{\sum (x - \bar{x})^{2}}{n}\)

= \(\frac{82.5}{10}\)

= 8.25

Explanation

4 girls and 5 boys

(a) p(only boys) = \(\frac{^{5}C_{3}}{^{9}C_{3}}\)

= \(\frac{5!}{2!3!} \times \frac{3!6!}{9!}\)

= \(\frac{10 \times 1}{84}\)

= \(\frac{5}{42}\)

(b) p(more girls than boys) = p(3 girls and no boys) or p(2 girls and 1 boy)

Number of ways of selecting = \(^{4}C_{3} \times ^{5}C_{0} + ^{4}C_{2} \times ^{5}C_{1}\)

= \(4 \times 1 + 6 \times 5\)

= 34 ways.

Without restrictions, selection can be made in \(^{9}C_{3}\) ways.

= \(\frac{9!}{6! 3!}\)

= 84 ways.

\(\therefore\) p(more girls than boys) = \(\frac{34}{84}\)

= \(\frac{17}{42}\).

Correct Answer: A. Teemah

Correct Answer: A. an assignment statement

Correct Answer: D) Amino acids

Explanation

Proteins are complex molecules that are essential for various functions in the body. They can be found in many foods such as meat, fish, eggs, and beans. When proteins are broken down, they provide different substances that the body needs. The question is asking what substance is provided when proteins are broken down. The options provided are Oxygen, Carbohydrate, Energy, and Amino acids. Out of these options, the correct answer is Amino acids. Amino acids are the building blocks of proteins, and when proteins are broken down, they are broken down into individual amino acids. These amino acids can then be used by the body to build new proteins, or they can be broken down further to provide energy or other substances that the body needs. It is important to note that while proteins can provide energy when they are broken down, the primary source of energy in the body is carbohydrates and fats. Additionally, oxygen is not directly provided when proteins are broken down, although it is needed for the process of breaking down proteins to occur. In summary, when proteins are broken down, they provide amino acids, which are the building blocks of proteins and can be used to build new proteins or provide the body with energy and other substances it needs.

Correct Answer: C. 1

Correct Answer: B. \(Cl_2 + 2NaF → 2NaCl + F_2\)

Explanation

The equation \(Cl_2 + 2NaF → 2NaCl + F_2\) does not illustrate correctly one of the reactions of chlorine.

In this reaction, chlorine reacts with sodium fluoride to form sodium chloride and fluorine gas. However, this reaction is not possible because fluorine is a much more reactive element than chlorine. When chlorine and fluorine react, they form a compound called chlorine trifluoride (\(ClF_3)\), which is a very powerful oxidizing agent.

Correct Answer: B. abnormal

Correct Answer: D. water, carbon dioxide, and energy