At least one girl: suppose a couple plans to have 4 children and the probability of a boy is 0.50. find the probability that the couple has at least one girl. round your answer to 3 significant digits*.
webassign will check your answer for the correct number of significant figures.


*significant digits: here are some probabilities expressed to 3 significant digits.
you start counting digits from left to right starting with the first non-zero digit.

0.123 0.0123 0.00123 0.102 0.350 0.300

When solving these types of problem, have a variable set for what you're trying to find.

Let x = the number that when 18 subtracts from 14 and a number will equal 18

Now build the equation.

In the question it says "14 times a number..." which means multiplication.
And also "18 less than" which is subtraction.

And this whole expression is equal to 80.

14x - 18 = 80

Solve for x.

14x - 18 = 80
14x = 98 <--- Add 18 both sides.
x = 7       <--- Divide both sides by 14.

So, x is equal to 7.