Exercise of statistics

Hi, please, I need your help with this exercise: Ho: μ = 12.4, Ha: μ 12.4; x = 11.4, σ = 4.2, n = 23
(i) Calculate the test statistic z . (Give your answer correct to two decimal places.)
Calculate p value (with four decimal places).

Z= -1. 14 but I don´t know how to obtain the p value as mu of Ho=12.4 and mu of Ha have to be different 12.4 Thanks