Answer:
Asnwer is A
Step-by-step explanation:
since the correlation between the FFQ and DR is 0.89
x y xy 
8.26 1.68 13.8768 68. 2276 2.8224
0.83 0 0 06889 0
20.13 15.1 303.963 405.2169 228.01
11.16 7.49 83.5884 124.5456 56.1001
7.18 12.84 92.1912 51.5524 164.8656
1.76 0 0 3.0976 0
22.46 25.06 567.8596 513.4756 628.0036
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∑
= ∑
= ∑
= ∑
= ∑
=
71.98 62.17 1061.479 1166.8046 1079.8017
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Correlation Coefficient or Pearson Correlation is given by:
the rest calculation is in the attached image
Answer:
B | 8.45 miles per hour.
Step-by-step explanation:
8.45 x 2 is 16.9.
Relative frequency = event/sample space
50/14 = 0.28
Expected probability = relative frequency*event
0.28*7500 = 2100
About 2100 trout is expected to be in the lake.
The cumulative frequency of students who earned a score of 20 or lower on the quiz is option d) 68.
<h3>What is the frequency about?</h3>
The relative cumulative frequency of students in the question is seen as those who earned a score of 20 to be 0.68 or 68 %.
From the question, The cumulative frequency of students who earned a score of 20 or lower on the quiz is:
= 4+8+15+7
=34.
Total frequency is:
= 4+8+15+7+7+3+4+2
=50.
Therefore, the relative cumulative frequency is:
= 34/50
= 0.68
= 68%
Hence, The cumulative frequency of students who earned a score of 20 or lower on the quiz is option d) 68.
Learn more about cumulative frequency from
brainly.com/question/23895074
#SPJ4
What must be subtracted from each term of the ratio 3:7 so that the ratio becomes 2:5?
My attempt: Let two numbers be 3x and 7x. So, 3x−y7x−y=25⟹15x−5y=14x−2y⟹y=x3. But the answer is given as 13 only.
I wish somebody could provide some clarifications.
