A test for reading ability in grade three is calibrated in such a way that the population distribution is normal with mean 50 and the standard deviation 4. A researcher believes that children with both parents being university graduates will have a higher population mean on this test. To test this hypothesis he takes a sample of n = 25 such children and tests the hypothesis H₀: = 50 H_a: > 50 He will reject H₀ in favor of the alternative if X > 51.736. What is the significance level of this test? Answer as percentage and to 1 decimal.