To solve this, we need to use the z test. The formula for z score is:
z = (x – u) / s
where x is sample value = 141.4 mm and above, u is mean value = 140 mm, s is standard dev = 8 mm.
z = (141.4 – 140) / 8
z = 0.175
From the standard probability tables, the p value at z = 0.175 using right tailed test is:
P = 0.4306
