A sales boy gave a change of N68 instead of N72. Calculate his percentage error

• A. 4%
• B. 5\(\frac{5}{9}\)%
• C. 5\(\frac{15}{17}\)%
• D. 7%

The table below shows the distribution of ages of workers in a company.

(a) Using an assumed mean of 39, calculate the (i) mean (ii) standard deviation; of the distribution.

(b) If a worker is selected at random from the company for an award, what is the probability that he is at most 36 years old?

If John starts work at 8.845am and finishes at 5.15pm. He has 90 minutes of break. How many hours does he work in 5 days?

• A.38
• B. 39
• C. 35
• D. 40

Solve the quadratic inequalities x² - 5x + 6 ≥0

• A. x ≤ 2, x ≥ 3
• B. x ≤ 3, x ≥ 2
• C. x ≤ -2, x ≥ -3
• D. x ≤-3, x ≥ 2

Find the value of \(\frac{tan 60^o - tan 30^o}{tan 60^o + tan 30^o}\)

• A. \(\frac{4}{\sqrt{3}}\)
• B. \(\frac{2}{\sqrt{3}}\)
• C. 1
• D. \(\frac{1}{2}\)

Find the value of k if y - 1 is a factor of y₃ + 4y₂ + ky - 6

• A. -6
• B. -4
• C. O
• D. 1

The time taken to do a piece of work is inversely proportional to the number of men employed. if it takes 45 men to do a piece of work in 5 days, how long will it take 25 men?

• A. 15 days
• B. 12 days
• C. 5 days
• D. 9 days

Find the coefficient of \(x^{3}\) in the expansion of \([\frac{1}{3}(2 + x)]^{6}\).

• A. \(\frac{135}{729}\)
• B. \(\frac{149}{729}\)
• C. \(\frac{152}{729}\)
• D. \(\frac{160}{729}\)

Factorize x² + 9x + 20

• A. (x − 5)²
• B. (x + 5)(x + 4)
• C. (x – 5)(x + 3)
• D. (x + 3)²

The table shows the operation * on the set {x, y, z, w}.

Find the identity of the element.

• A. W
• B. Y
• C. Z
• D. X