Use picture attached:
2 answers:
Answer:
correct answer is option D
Step-by-step explanation:
assume the speed of the unicorn for the first time to cover 50 mile be 'x'
we know,
distance = speed × time
50 = x × time
t₁ = 50 / x...............................(1)
when unicorn travel 300 mile with speed of '3x'
distance = speed × time
300 = 3 x × time
t₂ = 100/ x...............................(2)
dividing equation (2)/(1)
t₂ = 2 × t₁
hence, the time will be twice the first one.
correct answer is option D
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Answer:
So, we conclude that the best estimate for the difference in the proportion of smokers is 4.4%.
Step-by-step explanation:
We know that 27 of the 193 males in the sample smoke while 16 of the 169 females in the sample smoke.
We have the following proportion:
So we get that 13.9% of men smoke.
We have the following proportion:
So we get that 9.5% of women smoke.
We get: 13.9%-9.5%=4.4%.
So, we conclude that the best estimate for the difference in the proportion of smokers is 4.4%.