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Vika [28.1K]
2 years ago
15

the half life of radium-226 is 1600 years. after how many half-lives would 25% of the radium-226 remain?

SAT
1 answer:
docker41 [41]2 years ago
3 0

Answer:

400

Explanation:

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Layla has a coin that has a 60\%60%60, percent chance of showing heads each time it is flipped. She is going to flip the coin 55
valina [46]

The probability that she gets <em>more than 3 heads</em> is 0.3456.

There are only two possible outcomes for a fliped coin, either it is head, or it is tail. Since the result is independent of each other coins, the binomial distribution will be used.

Given the following parameters:  

  • x is the number of successes = 5 (coin flipped 5 times)
  • n is the number of trials
  • p is the probability of success on a single trial = 0.6

Using the binomial distribution formula:

P(X =x)=nC_x p^x (1-p)^{n-x}\\P(X =3) = 5C_3 \ (0.6)^3 (1-0.6)^{5-3}\\P(X =3) = 5C_3 \ (0.6)^3 (0.4)^{2}\\P(X=3)=0.3456

Hence the probability that she gets <em>more than 3 heads</em> is 0.3456.

Learn more on binomial distribution here: brainly.com/question/20559010

3 0
2 years ago
QUESTION 1
just olya [345]

Answer:

2

Explanation:

1+1=2

1+3=4

8 0
2 years ago
Which type of diversity refers to the amount if variation in the gene pool of a species?
n200080 [17]
I believe the answer to this is Genetic Diversity. 
5 0
3 years ago
How much does Gautrain cost??​
STALIN [3.7K]
Answer:

That depends where you’re going by train and where you’re taking the train from. It’s sort of like taking a plane to wherever you want to go. The farther you are from your destination, the more expensive it is.
3 0
2 years ago
Which student’s story is more interesting? i saw a snake. At first i thought it was an everyday garter snake. But after i looked
andriy [413]

There are different aspects to a story. The factors that makes this story interesting is that;

  • The writing style is exciting, and the author uses precise words.
  • The passage includes sensory details, such  as what the narrator saw and heard.
  • The passage makes it easy to decide how the  narrator felt during the event.
  • The event is told in a reasonable sequence.

There are different factors that can makes a story to be very interesting. Note that a  good story is centered around something that the audience do decides if it is interesting or vital.

A great story is known to comprise of the use of storytelling to make important news more interesting and it is known to be more than just to inform but to also adds value to the related topic.

See full question below.

What makes this story interesting? Check all of the boxes that apply.

The writing style is exciting, and the author  uses precise words.

I was hiking on a crisp, clear autumn morning  when a snake came slithering toward me. "It's  probably just a garter Snake," I thought. As  the snake slithered nearer, I spotted a rattle b at the tip of its tail. I jumped back with a gasp. The Snake was poisonous!

The passage includes sensory details, such  as what the narrator saw and heard.  The passage makes it easy to decide how the  narrator felt during the event. The event is told in a reasonable sequence.

Learn more about stories from

brainly.com/question/11728058

7 0
2 years ago
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