If the numbers on the spinner are 1, 2, 3, 4, 5, 6 (six numbers) the even numbers are 2, 4, 6 ( three numbers) than 3 out of 6 numbers on the spinner are even.
If Jane will spin the spinner below 30 times the is expected that less than half of the time 30/2 = 15 times will be an even number.