Solve this question and show your work please

L05 Q7. Researchers are interested in the mean age of a certain population. A random sample of 10 individuals drawn from the population of interest has a mean of 33. a] Assuming that the population is approximately normally distributed with variance 20, can we conclude that the mean is different from 30 years? (a: = 0. Eliza/2 = 1. 96). b] If the p - value is 0.0340, how can we use it in _r_1:|_a_l_(_i_r_1g_a__p_l_qi_s_ig_r_1_