The data of lifespan (in hours) for 16 flashlight batteries tested by ACE Company is recorded below. 45 30 77 50 54 38 27 66 33 22 56 60 50 40 34 55 i) Calculate the mean and variance. ii) Determine the modal value. Hence, interpret its meaning. ili) Given that 25% of the flashlight batteries have a lifespan less than X hours. Calculate the value of X. iv) Determine the shape of data distribution using an appropriate method