Abored statistician begins to flip a coin. he flips the coin 5 times and records the proportion of heads. then he flips the coin 15 times and records the proportion of heads. then he flips the coin 30 times and records the number of heads. he begins to see a trend, the more times he flips the coin, the closer he gets to 0.5 heads. this is an example of:

Hello!

This is an example of experimental probability.

Experimental probability is data collected while doing an experiment. If you have lots of trials, the experimental probability will be very close to the theoretical probability, which is the probability based off of the numbers. So, it is a 50 50 chance of getting a heads, so the theoretical probability is 0.5. The experimental probability, after many experiments, would also come close to 0.5.

I hope this helps!

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet