Subjects for the next presidential election poll are contacted using telephone numbers in which the last four digits are randoml

Question

3 years ago

11

Subjects for the next presidential election poll are contacted using telephone numbers in which the last four digits are randoml

y selected (with replacement). find the probability that for one such phone number, the last four digits include at least one 0.

Mathematics

2 answers:

Mamont248 [21] · Answer 1 · 2022-07-15T03:15:19+03:00

The complementary event of that the last four digits include at least one 0 is that the last four digits do not include any 0. So, for the first digit, there are 9 ways to pick a digit from 1 to 9. Similarly, there are 9 ways to pick each of other digits. Then the probability that a 4-digit numbers that do not include 0 is chosen is (9*9*9*9)/10^4 = 0.6561. So the probability that the last four digits include at least one 0 is 1 – 0.6561 = 0.3439

Galina-37 [17] · Answer 2 · 2022-07-15T05:17:31+03:00

Galina-37 [17]3 years ago

3 0

Answer:.344 if you have to round to the third decimal

Step-by-step explanation: