Answer:
They are often given by athletes.
So the answer is C
The standard deviation of the average age of a breed of dog is said to be 3.69.
<h3>What is the standard deviation about?</h3>
Note that we take:
- x = dog age has mean 19.5
- Unknown standard deviation.
Hence:
z = (x - mean) /SD is distributed N (0,1) - mean o standard deviation 1 (standard normal)
Since 20% of dogs are known to be older than 22.6 years:
So 22.6 years is said to be 80th percentile,
Since z matching to 80th percentile (using the standard normal table) s is <em>0.84.</em>
Then one need to plug z, x which is = 22.6
mean = 19.5 into the stated z equation:
Hence,
0.84 = (22.6 - 19.5)/SD
SD = (22.6 - 19.5)/0.84
= 3.69
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The oxidation state of Lithium changed from 0 to +1
The oxidation state of hydrogen changed from +1 to 0.
<h3>What is the oxidation state of the elements in the reaction?</h3>
The equation of the redox reaction is given as follows:
2 Li + 2 H₂O → 2 LiOH + H₂
The oxidation states of the elements changed as follows:
The oxidation state of Lithium changed from 0 to +1
The oxidation state of hydrogen changed from +1 to 0.
In conclusion, the reaction is a redox reaction.
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