Answer: If Jon's experimental probability of striking out at baseball is 13%, we can assume that the probability of Jon not striking out is 1 - 0.13 = 0.87.
Now, we can use the binomial probability formula to calculate the probability of Jon striking out k times in n trials, where n = 30 and p = 0.13:
P(k strikes) = (n choose k) * p^k * (1-p)^(n-k)
We want to find the expected number of times Jon will strike out, which is given by the formula:
E(X) = n * p
So, substituting the values we get:
E(X) = n * p = 30 * 0.13 = 3.9
Therefore, Jon is expected to strike out about 3.9 times out of 30 times at bat. Since we cannot have a fractional number of strikeouts, we can round off the answer to the nearest whole number, which gives us 4 as the expected number of strikeouts.