**LR 01: Likelihood ratio
and the binomial distribution
**

A suspect is apprehended with 10 mobile phones in his possession,

of which 7 are contaminated with cocaine.

Assume that database studies of mobile phones show that mobile phones from persons

convicted of handling cocaine show a 76% contamination rate, while mobile phones

from the general population show a 5.5% contamination rate.

Calculate the **likelihood
ratio** for the evidence using the hypotheses:

- Prosecution: The suspect had deliberate contact with cocaine.

- Defence: The contamination of the mobile phones was
accidental

Video Answer:
1.58 ×10^{6} .