Question

The probability that any postcard posted in Portugal on Monday is delivered to the UK within a week is 0.62.

The probability that any postcard posted in Portugal on Friday is delivered to the UK within a week is 0.41.
Anna is on holiday in Portugal. She posts 15 postcards to the UK on Monday.
How many of her postcards can she expect to be delivered within a week?

Answer 1

She expect 9 postcards to be delivered within a week.

Explanation:

We are given that The probability that any postcard posted in Portugal on Monday is delivered to the UK within a week is 0.62

We are also given that The probability that any postcard posted in Portugal on Friday is delivered to the UK within a week is 0.41.

Now we are supposed to find How many of her postcards can she expect to be delivered within a week if She posts 15 postcards to the UK on Monday.

So, The probability that any postcard posted in Portugal on Monday is delivered to the UK within a week =0.62

She expect no. of postcards to be delivered within a week.=
`15 * 0.62`

She expect no. of postcards to be delivered within a week.=9.3

So, She expect 9 postcards to be delivered within a week.