Mrs Chan is planning to go shopping at the shopping mall. The probability that she will purchase over $1000 is 0.1, and the probability that she will purchase over $500 but not more than $1000 is 0.3. Find the probability that Mrs Chan will get at least one $100 cash coupon.

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Mrs Chan is planning to go shopping at the shopping mall. The probability that she
will purchase over $1000 is 0.1, and the probability that she will purchase over $500,
but not more than $1000 is 0.3.
Find the probability that Mrs Chan will get at least one $100 cash coupon.
Transcribed Image Text:Mrs Chan is planning to go shopping at the shopping mall. The probability that she will purchase over $1000 is 0.1, and the probability that she will purchase over $500, but not more than $1000 is 0.3. Find the probability that Mrs Chan will get at least one $100 cash coupon.
A shopping mall is having a seasonal lucky draw. For every purchase over $500, a
customer can enter the lucky draw once. In the lucky draw, the customer draws a ball
from a box containing 80 balls in comprising four different colours. Each colour
represents a prize, as shown below.
Colour Number of balls
In the box
2
Red
Blue
Yellow
White
10
28
40
Prize
A gold coin
$100 cash coupon
$50 cash coupon
$20 cash coupon
Transcribed Image Text:A shopping mall is having a seasonal lucky draw. For every purchase over $500, a customer can enter the lucky draw once. In the lucky draw, the customer draws a ball from a box containing 80 balls in comprising four different colours. Each colour represents a prize, as shown below. Colour Number of balls In the box 2 Red Blue Yellow White 10 28 40 Prize A gold coin $100 cash coupon $50 cash coupon $20 cash coupon
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