Explanation Given information: f ( x ) = e − x 2 / 2 Formula used: 1) Chain rule of differentiation : d d x [ f ( g ( x ) ) ] = f ' ( g ( x ) ) g ' ( x ) d d x e f ( x ) = e f ( x ) f ' ( x ) 2) Product rule of differentiation: d d x [ f ( x ) g ( x ) ] = f ( x ) g ' ( x ) + g ( x ) f ' ( x ) Proof: The function f has inflection points at x = a , if f " ( a ) = 0 . Hence, find the first derivative f ' ( x ) . f ( x ) = e − x 2 / 2 By using thechain rule of derivative, f ' ( x ) = e − x 2 / 2 ( − 2 x 2 ) ⇒ f ' ( x ) = e − x 2 / 2 ( − x ) Next, find thesecond derivative f ' ' ( x ) , that is, d d x [ e − x 2 / 2 ( − x ) ] f ' ' ( x ) = − d d x x e − x 2 / 2 Using theproduct rule, f ' ' ( x ) = − ( 1 e − x 2 / 2 + x e − x 2 / 2

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Chapter 12.4, Problem 21E

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To prove: The function f(x)=e−x2/2 hasinflection pointsat x=±1.

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Chapter 12.4, Problem 20E

Chapter 12.4, Problem 22E

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Chapter 12 Solutions

Pearson eText for Calculus & Its Applications -- Instant Access (Pearson+)

Ch. 12.1 - Compute the expected value and the variance of the...Ch. 12.1 - Prob. 2CYU Ch. 12.1 - Prob. 1E Ch. 12.1 - Prob. 2E Ch. 12.1 - Prob. 3E Ch. 12.1 - Prob. 4E Ch. 12.1 - Prob. 5E Ch. 12.1 - Probability Table, Expected Value The number of...Ch. 12.1 - Prob. 7E Ch. 12.1 - Prob. 8E

Ch. 12.1 - Decision Making Based on Expected Value A citrus...Ch. 12.1 - Prob. 10E Ch. 12.2 - Prob. 1CYU Ch. 12.2 - Prob. 2CYU Ch. 12.2 - Prob. 1E Ch. 12.2 - Prob. 2E Ch. 12.2 - Prob. 3E Ch. 12.2 - Prob. 4E Ch. 12.2 - Prob. 5E Ch. 12.2 - Prob. 6E Ch. 12.2 - Prob. 7E Ch. 12.2 - Prob. 8E Ch. 12.2 - Prob. 9E Ch. 12.2 - Prob. 10E Ch. 12.2 - Prob. 11E Ch. 12.2 - Prob. 12E Ch. 12.2 - Prob. 13E Ch. 12.2 - Prob. 14E Ch. 12.2 - Prob. 15E Ch. 12.2 - Prob. 16E Ch. 12.2 - Prob. 17E Ch. 12.2 - Prob. 18E Ch. 12.2 - Prob. 19E Ch. 12.2 - Prob. 20E Ch. 12.2 - Prob. 21E Ch. 12.2 - Prob. 22E Ch. 12.2 - Prob. 23E Ch. 12.2 - Prob. 24E Ch. 12.2 - Prob. 25E Ch. 12.2 - Prob. 26E Ch. 12.2 - An experiment consists of selecting a point at...Ch. 12.2 - Prob. 28E Ch. 12.2 - Prob. 29E Ch. 12.2 - Prob. 30E Ch. 12.2 - Prob. 31E Ch. 12.2 - Prob. 32E Ch. 12.2 - Prob. 33E Ch. 12.2 - Prob. 34E Ch. 12.2 - Prob. 35E Ch. 12.2 - A random variable X has a cumulative distribution...Ch. 12.2 - Prob. 37E Ch. 12.2 - Prob. 38E Ch. 12.3 - 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Prob. 11E Ch. 12.4 - Prob. 12E Ch. 12.4 - Reliability of Electronic Components Suppose that...Ch. 12.4 - Prob. 14E Ch. 12.4 - Prob. 15E Ch. 12.4 - Find the expected values and the standard...Ch. 12.4 - Prob. 17E Ch. 12.4 - Find the expected values and the standard...Ch. 12.4 - Prob. 19E Ch. 12.4 - Prob. 20E Ch. 12.4 - Prob. 21E Ch. 12.4 - Prob. 22E Ch. 12.4 - Prob. 23E Ch. 12.4 - Prob. 24E Ch. 12.4 - Prob. 25E Ch. 12.4 - Normal Distribution and Life of a Tire Suppose...Ch. 12.4 - Amount of Milk in a Container If the amount of...Ch. 12.4 - Breaking weight Theamount of weight required to...Ch. 12.4 - Time of a commute A student with an eight oclock...Ch. 12.4 - Prob. 30E Ch. 12.4 - Diameter of a Bolt A certain type of bolt must fit...Ch. 12.4 - Prob. 32E Ch. 12.4 - Prob. 33E Ch. 12.4 - Prob. 34E Ch. 12.4 - Prob. 35E Ch. 12.4 - Prob. 36E Ch. 12.4 - Prob. 37E Ch. 12.5 - A public health officer is tracking down the...Ch. 12.5 - Suppose that a random variable X has a Poisson...Ch. 12.5 - Prob. 2E Ch. 12.5 - 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Rolling Dice A pair of dice is rolled until a 7 or...Ch. 12 - Rolling Dice A pair of dice is rolled until a 7 or...Ch. 12 - Rolling Dice A pair of dice is rolled until a 7 or...

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To prove: The function f ( x ) = e − x 2 / 2 hasinflection pointsat x = ± 1 .

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Chapter 12 Solutions