The probability that a person in the united states has type b+ blood is 1212%. threethree unrelated people in the united states are selected at random. complete parts (a) through (d).

(a)    P (all B+) = (0.12)(0.12)(0.12)=0.001728=0.1728%

(b)   P (no B+) = (0.88)(0.88)(0.88) = 0.681472=68.15%

(c)    P (not one B+) + P (no B+) = 1

P (not one B+) = 1 – P (no B+)

                             = 1 – 0.681472

P (at least 1 B+) = 0.318528=31.85%

(d)   B. The event in part (a) is unusual because its probability is less than or equal to 0.05.

hey there!

if she's saving for six months, let's divide the total number we need for the trip by six, dividing it into the amount that needs to be saved for each month.

500 ÷ 6 =

she needs to save at least this amount each month, so we should use this symbol: ≥

let x be the amount she saves each month.

your final answer is x ≥

hope this !

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