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Step-by-step explanation:

we have to wrote down all the possible 3digit numbers and calculatevtheir sum

259+295+529+592+925+

952=3552

(the digits cant be repeated because they are written on cards only once)

The sum of all possible scores  3552.

What is probability?

Probability is the measure of the likelihood that an event will occur in a Random Experiment. Probability is quantified as a number between 0 and 1, where, loosely speaking, 0 indicates impossibility and 1 indicates certainty. The higher the probability of an event, the more likely it is that the event will occur.

Given:

Joe is shown 3 cards marked 2, 5 and 9.

we have write all the possible 3digit numbers

First taking 2 at hundred place value

259

295

Now, taking 5 at hundred place value

529

592

Now, taking 9 at hundred place value

925

952

Now, add the above 3 digit numbers

=259+295+529+592+925+952

= 3552

Hence, the sum of all possible scores  3552.

Learn more about probability here:

https://brainly.com/question/11234923

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