There should be up to "4 roots," there can't be more or less than 4 total solutions. First, we need to check how many sign changes are there in this function. There are 3 positive real roots. Now lets check for negative roots.
There are is only 1 negative real root. Since we basically have 4 real roots, and the max is 4. There should be 4 real roots and 0 complex roots.
Here are the two methods you can perform this question :Method 1: Probability that they are boys: 0.528 (4 squared) = 0.0777205Probability that 1 is a girl: 1 - 0.0777205 = 0.9222795 = 92.22% Method 2:n=4p(boys)= 0.5281-o.528 = 0.9222795= 92.22%