Decide whether the normal approximation is appropriate by checking the rule of thumb. tion 0.30 0.20 Probability 0.10 5 X binomial with n-20. ped.1 Visually, the histogram appears positively skewed, not symmetric So we know right away that we should not use the normal approximation. If we did not have the histogram to visually see the shape of the distribution, we could use our rule of thumb. Check to see if np 2 10 and nq 2 10. np = and nq = Do our guidelines indicate that the normal approximation is appropriate for this binomial random variable? Check Yes, normal approximation is appropriate No, normal approximation is not appropriate page Next page