Question

1.
Suppose you take a true/false quiz that contains five true/false questions. Let an even digit represent a correct answer and an odd digit represent an incorrect answer. In the five trials shown, how often did you get at least 3 questions correct? (Note: Assume there is a 0 before the number 4908 in the first trial.)

Answer 1

You need to give the five numbers for the 5 trials to enable anybody to help you.

Answer 2

4908
98427
57497
90707
28507

Answer 3

@kropot72

Answer 4

Do you know whether zero is even or odd?

Answer 5

RanIt, 0,99999

Answer 6

It's even right

Answer 7

Yes, zero is an even number. How many even digits are there in the first number?

Answer 8

4?

Answer 9

Good, you're right. So you can now finish the problem?

Answer 10

Uhhhh.... So 4 is the answer

Answer 11

No! It's 3!!!

Answer 12

Right!????

Answer 13

No, 4 is not the final answer. The result of finding 4 even digits in the first number means that in the first trial 3 or more questions were answered correctly.
The second number is the result of the second trial. Were 3 or more questions answered correctly in the second trial?

Answer 14

It's 3

Answer 15

Is 3 your answer to the question "how often did you get at least 3 questions correct?"

Answer 16

Yes 3 is my final answer

Answer 17

The correct answer is that you got 3 or more questions right in 3 out of 5 trials.

Answer 18

So yes 3 is correct

Answer 19

Not really. The question asks "how often" therefore your answer must include "3 out of 5 trials"

Answer 20

Ok

Answer 21

Glad that you understand :)