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STA1510 ASSIGNMENT 2 FOR 2026

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University Of South Africa (Unisa)
Course
Basic Statistics (STA1510)
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STA1510 ASSIGNMENT 2 FOR 2026

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STA1510
ASSIGNMENT 01
YEAR: 2026

, Question 1
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Question text
A bag contains 3 red and 2 blue marbles. You are asked to select two marbles from the bag. A marble
is selected from the bag, and then set aside without replacement. A second marble is then selected
from the bag.
What is the probability that the two marbles selected will be of different colours?


a.
0.60

b.
0.40

c.
0.24

d.
0.30

e.
0.09
Question 2
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Question text
The time taken to complete a motorcycle race is normally distributed, with an average time (µ) of 2.5
hours and a standard deviation (null) of 0.5 hours.
What is the probability that a randomly selected cyclist will take between 2.35 and 2.75 hours to
complete the race?


a.
0.0736

b.
0.3085

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