Calculate the probability of landing exactly 3 heads when a fair coin is tossed 5 times.

0.3125

Step-by-step explanation:

When a fair coin is tossed we find that

there are only two outcomes

Each toss is independent of the other

Hence if Xis no of heads then X is binomial with n = 5 and p = 0.5

Using binomial formula we can find probability for getting 3 heads exactly.

Required probability

= P(X=3)

=

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

b

step-by-step explanation:

multiply terms on numerator/ denominator by (x - 1)

= ← distribute numerator/ denominator

= ← simplify

=

= → b