Mathematics, 18.01.2021 14:00 Tnguyen8160

Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally distributed, with a mean of 4.9 millimeters (mm) and a standard deviation of 1.2 mm. For a randomly found shard, find the following probabilities. (Round your answers to four decimal places.) (a) the thickness is less than 3.0 mm
(b) the thickness is more than 7.0 mm
(c) the thickness is between 3.0 mm and 7.0 mm

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Answer from: laneycasey9058

a) The probability that the thickness is less than 3.0 mm

P(X<3.0) = 0.057

b) The probability that the thickness is less than 7.0 mm

P(X>7) = 0.0401

c) The probability that the thickness is between 3.0 mm and 7.0 mm

P( 3 < x < 7)= 0.9029

Step-by-step explanation:

Step(i):-

Given mean of the Population (μ) = 4.9 mm

Standard deviation of the Population(σ) = 1.2 mm

Let 'X' be the random variable in normal distribution

$Z = \frac{x-mean}{S.D} = \frac{3.0-4.9}{1.2} = -1.583$

The probability that the thickness is less than 3.0 mm

P(X1.583)

= 1 - ( 0.5 + A(1.583)

= 0.5 - A(1.583)

= 0.5 - 0.4430

= 0.057

The probability that the thickness is less than 3.0 mm

P(X<3.0) = 0.057

Let 'X' be the random variable in normal distribution

$Z = \frac{x-mean}{S.D} = \frac{7.0-4.9}{1.2} = 1.75$

The probability that the thickness is less than 7.0 mm

P(X7.0) = P(Z 1.75) = 0.5 - A(1.75)

= 0.5 - 0.4599 ( from normal table )

= 0.0401

The probability that the thickness is less than 7.0 mm

P(X>7) = 0.0401

Let 'X' be the random variable in normal distribution

$Z_{1} = \frac{x_{1} -mean}{S.D} = \frac{3.0-4.9}{1.2} = -1.583$

$Z_{2} = \frac{x_{2} -mean}{S.D} = \frac{7.0-4.9}{1.2} = 1.75$

The probability that the thickness is between 3.0 mm and 7.0 mm

P( 3 < x < 7) = P( - 1.583 < X < 1.75 )

= A( 1.75 ) + A( -1.583)

= A(1.75)+A(1.583)

= 0.4599 + 0.4430

= 0.9029

The probability that the thickness is between 3.0 mm and 7.0 mm

P( 3 < x < 7)= 0.9029

Answer from: Quest

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20

Answer from: Quest

replication and blocking

step-by-step explanation:

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