There are 10 digits on the phone keypad, from 0 to 9. What is the probability that the accidentally

There are 10 digits on the phone keypad, from 0 to 9. What is the probability that the accidentally pressed digit will be less than 4?

Let’s describe a random event. This event consists in the fact that accidentally pressed out of ten digits on the phone keypad will turn out to be less than 4. Let’s designate this event as A.

The probability of a random event P (A) is calculated by the formula:

P (A) = n / N,

where n is the number of experience outcomes favorable to the onset of event A,

N is the total number of outcomes.

Under the conditions of this problem, n = 4 (since the digits that are less than 4 are four digits – 0, 1, 2, 3), N = 10 (the total number of digits from 0 to 9).

Then

P (A) = 4/10 = 0.4.

Answer: 0.4.