The number of planes to arrive at the Dubai International Airport over N days were

recorded and inputted into MINITAB for analysis. Exhibit 1 was subsequently

generated.

Exhibit 1

Stem-and-Leaf Display: No. of Arrival

Leaf Unit = 1 N =*

5 2 01123

10 2 56899

** 3 0001123

(***) 3 6666678888

12 4 01134

7 4 57789

2 5 00

i. Calculate he missing values *, ** and *** [3]

ii. Find the value of the

a) Median [1]

b) Highest value [1]

c) Mode [1]

c) Using the stem and leaf diagram in Exhibit 1,

i. Form a frequency table by identifying the class intervals implicitly.[2]

Using the table created in 2ci) above,

ii. Calculate the sample mean [2]

iii. Calculate the sample variance