Question: 01

The following data refers to the price of mobile phones used by office going people during the year of

2017 to 2018.

460, 720, 538, 702, 575, 438, 635, 721, 617, 840, 890, 560, 570, 706, 430, 968, 638, 565, 728, 870, 620,

347, 868, 610, 765, 550, 787, 957, 505, 320, 258, 490, 705, 530, 845

a) Prepare a stem and leaf display.

b) How can you split a Stem and leaf display? Can you split the above stem and leaf display?

c) Condense the stem and leaf display by grouping the stems.

Question: 02

Part A:

Consider the following two data sets:

Data set 1: 37,41,25,12,9

Data set: 44,32,48,19,12

Each of the values in Data 2 is obtained by adding a number to the corresponding value of the first data

set. Calculate:

a) Standard deviation for the 2 data sets using the for formula for sample mean.

b) Make a conclusion based on the standard deviation.

Part B:

Bangladesh imports apple from 3 different countries in a month as shown in the following table:

Country Baskets Piece per Basket

Australia 1000 95

India 200 92

China 100 99

Find the mean price for all 1300 baskets in that month.

Question: 03

The Probability of success of an open-heart surgery is 84%. What is the probability that in 2 randomly

selected open-heart operations at least one will be successful? Draw a tree diagram doe this

experiment.