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Journalize the following transactions related to merchandising operations that occurred in August while paying attention to the credit terms:

Aug 1 - Purchased merchandise on account from ABC $1,500, FOB shipping point, terms n/30. The party paying the freight paid it in cash.
Aug 3 - Received credit of $200 from ABC for merchandise with flaws that you decided to keep.
Aug 5 - Sold merchandise on account to customers $500, terms 1/10,n/30. Cost of the items sold $250.
Aug 9 - Paid ABC.
Aug 25 - Granted credit of $200 to customers for merchandise returned with cost $100.
Aug 26 - Received payments on account from customers $200.

In a reading test, 90 pupils out of 140 passed the test. The sample mean was 78. Find and q where p was the proportion of these who passed the test. Estimate the population proportions.