Smith is a weld inspector at a shipyard. he knows from keeping track of good and substandard welds that for the afternoon? shift, 5% of all welds done will be substandard. if smith checks 300 of the 7500 welds completed that? shift, would it be unusual for smith to find 30 or more substandard? welds?

The probability of finding a substandard weld is: p = 5% = 0.05 
We are given that the sample size: n = 300 
Using the Poisson Distribution , the average number of welds (m) is:

m = n*p =

m = 300 * 0.05 
m =15 

The standard deviation of welds (s) is calculated by:

s = sqrt (m)

s = sqrt (15)

s = 3.873

Assuming normal distribution, the z value corresponding to 30 sub standards is:
z =( X - Mean) / standard deviation 
z =(30 - 15) / 3.873 
z = 15 / 3.873 
z = 3.87

 
The z value based on the standard normal curves has a maximum value of 3.49. Beyond that z value of 3.49 would mean exceeding 100%. Therefore z = 3.87 is not normal and definitely it is unusual to find 30 or more substandard.

the population of other specie of birds will decline or other specie of birds will find some alternate source of food to survive.

explanation:

according to the competitive exclusion principle, which is also known as gause's law, two specie living in the same niche and feeding on the same resource cannot co-exist stably.

as we have well studied the theory of natural selection which states that only those organisms survive which have better tendency to compete for food and adapt to the environmental conditions.

coming towards the question, what wi ll happen when one species outcompetes the other for the small fish , the other specie will not get enough food and will start to die or decline in population. eventually either other specie needs to find another alternative food source for itself or migrate at some other location where there is less competition otherwise it will just not exist anymore at that niche.

hope it !

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