Question 1106314
z=(x-mean)/sd or (xbar-mean)/sigma/sqrt(n)
z=(0.148-0.150)/0.003=-2/3.  probability z< (-2/3) is 0.2525
z=-0.002*sqrt(4)/0.003 or -4/3.  Probability z < -(4/3) is 0.0912
z=-0.002*sqrt(10)/0.003=0.0174.  Notice the inverting of the denominator fraction so that sqrt(n) is in the numerator.