COMSATS University Islamabad- Lahore Campus, Lahore

S2 Examination – 2021

Course Title:

Introduction to Statistics

Course Code:

MTH-161

Credit Hours:

3(3,0)

Course Instructor/s:

, Salman Abbas

Program Name:

BBA, BECO

Semester:

3^th

Batch:

Fall

Section:

B, C,

Date:

07-05-202

Time Allowed:

90 Minutes

Maximum Marks:

15

Student’s Name:

Reg. No.

CIIT/

Attempt all questions.

Question 1:                                                                                                                          (2.5+2.5)

Daraz Mall Company provides free examination of its products for 7 days. If not completely satisfied, a customer can return the product within that period and get a full refund. According to past records of the company, an average of 2 of every 10 products sold by this company are returned for a refund.

Find the probability that exactly 6 of the 40 products sold by this company on a given day will be returned for a refund.

Find the probability that no more than 3 of the 20 products sold by this company on a given day will be returned for a refund

Question 2:                                                                                                                          (2.5+2.5)

Early in October COMSATS discovers that it can accommodate a few extra students. Enrolling those additional students would provide a substantial increase in revenue without increasing the operating costs of the university; that is, no new classes would have to be added. From experience the university knows that the frequency of enrollment given admission for all students is 40%.

What is the probability that at most 4 students will enroll if the college offers admission to 10 more students?

If the frequency of enrollment given admission for all students was 70%, what is the probability that at least 12 out of 15 students will enroll?

Question 3:                                                                                                                             (3+2)

Huawei has several stores in major metropolitan shopping centers. The company’s sales experience indicates that daily cell phone sales in its stores has a mean of 60 and a standard deviation of 15. The marketing department conducts number of routine analyses of sales data to monitor sales performance. What is the probability that store sales days will have sales between 85 and 95?

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