Mathematics, 01.07.2020 20:01 jself

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?

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