FeaturesHow It WorksFor ParentsPricingContactLog inStart free β€” no credit card needed β†’

Mathematical Methods Β· Unit 3 Β· Discrete random variables Β· Binomial distributions

Determine and use the probabilities 𝑃(𝑋 = π‘Ÿ) = (𝑛 π‘Ÿ) π‘π‘Ÿ (1 βˆ’ 𝑝)π‘›βˆ’π‘Ÿ associated with the binomial distribution with parameters 𝑛 and 𝑝.

Practise this objective

AI-marked practice questions tied to QCAA mark schemes for this exact LO. Free to start.

Start free practice

Practice questions for this objective

Full questions, answers and worked solutions unlock when you start a free practice session.

Question 1

A quality-control inspector tests batches of electronic components. The probability that a randomly selected component is defective is $0.08$. If a batch of 15 components is tested, what is the probability that exactly 3 components are defective?

Worked answer
πŸ”’ Start free to see full answer
Question 2

A quality-control officer inspects batches of light bulbs. Historical data shows that $8\%$ of bulbs produced are defective. If a random sample of $15$ bulbs is selected, determine the probability that exactly $2$ bulbs are defective. Express your answer as a decimal, correct to $4$ decimal places.

Worked answer
πŸ”’ Start free to see full answer
Question 3

A manufacturer produces electronic components, and historical data shows that 15% of components are defective. A quality inspector randomly selects 8 components from the production line. Let \(X\) represent the number of defective components in the sample. What is the probability that exactly 2 components are defective?

Worked answer
πŸ”’ Start free to see full answer
Unlock all 3 answers β€” free

More in Binomial distributions

← Previous
Calculate the mean 𝑛𝑝 and variance 𝑛𝑝(1 βˆ’ 𝑝) of a binomial distribution using technology and algebraic methods.
Next β†’
Identify contexts suitable for modelling by binomial random variables.
All LOs in Binomial distributionsBack to full Mathematical Methods syllabus