A parcel delivery company(ACE Courier Company)knows the average weight of all parcels delivered by other companies is 7.5 kg.The ACE Courier Company deals with an accounting firm and believes the firm sends parcels whose weight is different from that of other companies. a) Define the null and alternative hypotheses b) Draw a diagram that illustrates the rejection region for a 5% significance level.Show the critical value(s) c)If the test statistic is calculated to beZ(calculated)=1.81 and a=0.05 what conclusion can be drawn