一道统计题,科学家要测试HO：μ = 9HA：μ > 9假设这是基于25人（样本）的测试,平均数为9.1,标准差为0.5

一道统计题,
科学家要测试
HO：μ = 9
HA：μ > 9
假设这是基于25人（样本）的测试,平均数为9.1,标准差为0.5,求P值为多少?保留四位小数.
这是原文：
Suppose the scientists wanted to test
HO：μ = 9
HA：μ > 9
Assume that based on the responses of 25 participants they observed a mean score of 9.1 and that the standard deviation is known to be 0.5.What is the P-value for this test?Use four decimal places.
我算出来是0.5793,但是答案是错的