The Smith family was one of the first to come to the U. S. They had 5 children. Assuming that the probability of a child being a girl is .5, find the probability that the Smith family had:

at least 3 girls?
(round to 4 decimal places)

at most 4 girls?
(round to 4 decimal places)

b. the decimal could be two-tenths.

step-by-step explanation:

7

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places