I think it is the three one
Answer:
Step-by-step explanation:
mean diameter = 206
variance = 6.25
standard deviation = √ variance
σ = √ 6.25 = 2.5
sample size n = 90
z = deviation from mean / (σ / √n)
= 0.3 / (2.5/ √90)
= .3 / .2635
= 1.1385
P value from the table = (.87 - .5 ) x 2
= .37 x 2 .
or 74 % .
Answer:

We want to calculate this probability:

And we can use the total probability rule and we have this:

The probability that a woman selected at random has had cancer or smokes, or both is 0.21
Step-by-step explanation:
For this case we define the following events
B= the women selected had breast cancer
S= the women selected is a smoker
= the women selected is a smoker and had breat cancer
And for this case we have the following probabilities given:

And we want to calculate this probability:

And we can use the total probability rule and we have this:

The probability that a woman selected at random has had cancer or smokes, or both is 0.21
Answer: 3.6
Step-by-step explanation:
½bh = 6.12
½ × 3.4 × b = 6.12
b = 6.12/ 1.7