4.1 Probability (A-level only)

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Question 136

Two events $E$ and $F$ satisfy $\cap F) = 0$ . State the technical term used to describe the relationship between these two events.

[1]

A diagnostic test uses two separate chemical indicators, Alpha ( $A$ ) and Beta ( $B$ ), to detect a specific enzyme. Indicator $A$ activates independently of indicator $B$ .

The probability that indicator $A$ activates is $34\frac{3}{4}$ . The probability that at least one of the indicators activates is $1720\frac{17}{20}$ .

Determine:

$P (B)$

[2]

$\cap B')$

[2]

$P (A^{'} ∣ B)$

[2]

Two events $E$ and $F$ satisfy $\cap F) = 0$ . State the technical term used to describe the relationship between these two events.

[1]

A diagnostic test uses two separate chemical indicators, Alpha ( $A$ ) and Beta ( $B$ ), to detect a specific enzyme. Indicator $A$ activates independently of indicator $B$ .

The probability that indicator $A$ activates is $34\frac{3}{4}$ . The probability that at least one of the indicators activates is $1720\frac{17}{20}$ .

Determine:

$P (B)$

$P (A^{'} ∣ B)$

[2]

4.1 Probability (A-level only)

Question 136

Markscheme

4.1 Probability (A-level only)

Question 136

Markscheme

4.1 Probability (A-level only)

Question 136

4.1 Probability (A-level only) Questions

4.1 Probability (A-level only)

Question 136

4.1 Probability (A-level only) Questions