Question

PLEASE REALLY NEED HELP IM STRUGGLING

Answer 1

Answer:

a.) 0.25%

Step-by-step explanation:

i just took the test

Answer 2

At Venn diagram there are 4 parts (20 pieces):

1. Colored only in blue - quadrilaterals with four equal side lengths (3 pieces);

2. Colored only in orange - quadrilaterals with four right angles (6 pieces);

3. Colored in both blue and orange - quadrilaterals with four right angles and with four equal side lengths (2 pieces);

4. Colored in white - quadrilaterals withoutprevious two properties (9 pieces).

Consider events:

A - a randomly chosen quadrilateral has four right angles;

B - a randomly chosen quadrilateral has four equal side lengths;

Use formula $Pr(B|A)=\dfrac{Pr(A\cap B)}{Pr A}$ to find the probability that a randomly selected quadrilateral with 4 right angles also has four equal side lengths:

$Pr(A\cap B)=\dfrac{2}{20},\\Pr(A)=\dfrac{8}{20},\\Pr(B|A)=\dfrac{\frac{2}{20}}{\frac{8}{20}} =\dfrac{2}{8}=\dfrac{1}{4} =0.25$

Answer: Pr=0.25