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307.72 yard

Step-by-step explanation:

π d =98×3.14=307.72 yardππ

307.72 or A

Step-by-step explanation:

This might be confusing because it is in the diameter. The formula for finding the circumference of a circle is π · d.

With that in mind we can see that the answer is 98π

Multiplying gives 307.72 or A

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step-by-step explanation:

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85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560