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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Answer:
What increases the frequency of adaptive mutations? = hitch-hiking.
Explanation:
the mutator allele increases in frequency by hitch-hiking, thus facilitating the appearance of a second adaptive mutation
Based on this passage, suspense was created for the reader because: D. the reader does not know why the old man is killed.
<h3>What is suspense?</h3>
Suspense refers to a literary device which can be used to describe the anxiety, uneasy feeling, and anticipation that a reader feels based on what is most likely to happen next in a literary work.
Based on this passage, we can infer and logically conclude that suspense was created for the reader based on the fact that he or she didn't know why the old man was killed.
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Unattached earlobes and cleft chin : 9
Unattached earlobes and no cleft : 3
Attached earlobes and cleft chin : 3
Attached earlobes and no cleft :1
