I have to assume that you include 5 in your question then there are 6 sides and you can only win on 3 (1/3/5 ) or 3/6 which is 50% probability.
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If the dice or die are 6 sided, then you would most likely roll a 6 13.33333 times, which rounds to 13.
He should expect it 100 times.
40 times
The expected number of times is the probability x number of throws. Since you have a prob of 1/6 for a seven, then (1/6) * 160 = 26.67 times you would have success. We generally would round up the expected number of successes to the whole number 27.
You can expect to get a 5 about 15 times out of 90.