Answer:lol it looks like your cousin is on top of here tbh
Explanation:
II and IV appears to be the best option. II would improve air quality while III would improve the water. IV is a good option too. I doesnt really apply so you can rule out anything with I
Minimum probability is 0.05, so we have to choose n such that expected frequency corresponding to 0.05 probability should be at least 5.
Let n = 5
Expected frequency = n*p = 5 * 0.05 = 0.25 < 5
Let n = 25
Expected frequency = n*p = 25 * 0.05 = 1.25 < 5
Let n = 50
then
Expected frequency = n*p = 50* 0.05 = 2.25 < 5
Let n = 100
then
Expected frequency = n*p = 100* 0.05 = 5 = 5
Thus, for n = 100, we get expected frequency = 5,
Thus, the minimum number of times the spinner should be spun to conduct this test is 100.
<h3>What is a probability?</h3>
\
Probability means possibility. It is a branch of mathematics that deals with the occurrence of a random event.
Learn more about probability here,
brainly.com/question/743546
#SPJ4
Answer:
III only
Explanation:
The ozone layer is extremely important for the living organisms on Earth. It is a layer that manages to stop big portion of the UV radiation from reaching the surface of the Earth, thus minimizing its negative effects, and only letting enough of it to be useful for the living organisms. If the ozone layer is removed though, then the UV radiation will be so high that most of the living organisms on land would die out because they can not stand such high levels of UV radiation. The marine organisms will also be badly effected, and the majority of them will also die out because of too much radiation, thus making enormous damage to the life on the planet.