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Katen [24]
3 years ago
5

A person has forgotten the last digit of a telephone number, so he dials the number with the last digit randomly chosen. How man

y times does he have to dial (not counting repetitions) in order that the probability of dialing the correct number is more than 0.5.
Mathematics
1 answer:
aleksklad [387]3 years ago
4 0

Answer:

More than 5 times

Step-by-step explanation:

There are 10 options for the last digit (0, 1, 2.....9)

Probof 0.5 means 50% chance of getting it right,

Which would happen when he has tried 50% of the total possibilities, which are 10

50% of 10 = 5

He'll have to dial 5 times for a probability of 0.5.

More than 5 times for a probability of more than 0.5

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