假设检验英文数学题！！！！Suppose a hypothesis states that the mean is ex

假设检验英文数学题！！！！
Suppose a hypothesis states that the mean is exactly 50. If a random sample of 35 items is taken to test this hypothesis, what is the value of β if the population standard deviation is 7 and the alternative mean is 53? Use α = .01. Round the answer to 4 decimal places