if its 2 divided by 773, then it would just stay as 2/773.
If you meant 773 divided by 2 then it would be 386 and 1/2
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Answer with explanation:</h2>
Formula for plus-four confidence interval :

, where n= Sample size.
= Sample proportion and 
z* = Critical z-value.
Let p be the proportion of puppies area found with early hip dysplasia.
As per given , we have
n= 42

Since confidence interval is not given , so we assume it as 95% .
z-critical value for 95% confidence is 1.96.
Then, the required confidence interval will become :

Hence, the plus four confidence interval for p = (0.0484, 0.256)
Interpretation: We are 95% sure that the true proportion of puppies area found with early hip dysplasia lies in (0.0484, 0.256).
I think not fpr sure though