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
Learn more about standard deviation from
brainly.com/question/475676
#SPJ1
a. CPAs in public practice in the US are required to apply the IESBA Code, even if they don't perform services outside the US.
b. State boards of accountancy are required to adopt the IFAC's rules within 90 days of an IESBA rule change.
c. As a member body of IFAC, the AICPA is required to change its bylaws whenever the IESBA changes its rules.
d. The AICPA is required to adopt ethics standards that are at least as restrictive as the IESBA rules.
mass of sample is 363 grams.