A pharmacist wishes to select three brands of aspirin to sell in his store. He has five major brands to choose from: A, B, C, D
1 answer:
Answer:
(a) 0.6
(b) 0.3
(c) 0.9
Step-by-step explanation:
We are given that a pharmacist wishes to select three brands of aspirin to sell in his store. He has five major brands to choose from: A, B, C, D and E.
Total number of ways to select 3 brands from total of 5 = =
=
= 10 .
In all the three parts denominators remains at 10
(a) If he selects the three brands at random, the probability that he will select brand B = one brand B will be selected and other 2 brands will be selected from the remaining 4 brands i.e.
So, required probability = =
= 0.6
(b) The probability that he will select the brands B and C = Two brands will be selected of B and C and one brand will be selected from remaining 3 brands i.e.;
So, required probability = =
= 0.3 .
(c) The probability that he will select at least one of the two brands B and C
= 1 - Probability that neither of the three brands are from B and C
= 1 - Probability that all three brands are selected from the remaining
brands of A, D and E
= 1 - =
=
= 0.9 .
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The service area of the cylinder is 42 square fts.
Two parallel bases joined by a curving surface make up the three-dimensional solid known as a cylinder.
Typically, the bases are shaped like circles. The height "h" of the cylinder stands for the perpendicular distance between the bases, while "r" stands for the cylinder's radius.
The uses of cylinder are-
- A popular piece of scientific equipment used to determine the volume of a liquid is a graduated cylinder, sometimes referred to as a measuring cylinder or mixing cylinder.
- Its form is slender and cylindrical. The measured amount of liquid is shown by each marked line on the graduated cylinder.
Total surface area of the cylinder formula:
It is the sum of the base surface area and the lateral surface area;
Total area = base area + lateral area , or
Total area = 2 π r² + (2 π r) h , or
Total area = 2 π r (r + h)
Calculation for the total area of the cylinder;
Base diameter is 6 ft
Radius is 6/2 = 3 ft
Height is 4 ft
Total area = 23(3 + 4)
= 6×7
= 42
Therefore, the total surface area of the cylinder is 42 square fts.
To know more about the surface area of the cylinder, here
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