Task 2. Errors. Specificity and sensitivity To examine the specificity of a new PCR-type test, it has been used on 1000 healthcare workers in a high-risk environment who had symptoms, knowing that 50 % of them had COVID. The results obtained are summarized in this table: With COVID WITHOUT COVID Total Positive 457 7 464 Negative 43 493 536 Total 500 500 Calculate the significance a, tolerance ẞ, specificity 1-a and sensitivity 1-ẞ of this PCR test. What type of error is most likely in this test? Interpret the results.

Please help me answer the following questions. Thank you

You need to be reimbursed for the 36 light bulbs you bought. Unfortunately, the receipt is smudged andyou can only read $x82.5y where the spacing tells you that x and y are digits. You are sure that thebulbs were less than $15 each. How much did they cost? Use congruences to determine your answers.Show all the necessary work to obtain your answer.