Numerade

Questions asked

INSTANT ANSWER

What factors do we look at to determine maturity? Group of answer choices Ribeye area Lean muscle color Skeletal ossification Marbling

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INSTANT ANSWER

a given year has probability density function f ( x ) = 3 x ( 1 − x^ 4 ) for 0 ≤ x ≤ 1 . What is the probability that less than 1/ 2 of the apartments will need repairs during a given year?

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ANSWERED

Zhumagali Shomanov

Numerade educator

Find the value of k so that f ( x ) = k/ ( x + 1 ) ^2 for 1 ≤ x ≤ 2 is a probability density function.

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Gregory Higby

Numerade educator

You shoot an arrow into the air. It falls to earth and sticks into an oak tree. The distance x that an arrow goes into the tree has probability density function f ( x ) = 2/ 49 ( 7 − x ) for 0 ≤ x ≤ 7 . What is the probability that your arrow goes less than 2 inches into the tree?

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Carson Merrill

Numerade educator

You own an apartment building. The fraction x of apartments that need repairs to their plumbing during a given year has probability density function f ( x ) = 3 x ( 1 − x 4 ) for 0 ≤ x ≤ 1 . What is the probability that less than 1 2 of the apartments will need repairs during a given year?

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Jason Horton

Numerade educator

When you flip a fair coin 10 , 000 times, the number of heads is approximately normally distributed with µ = 5 , 000 and σ = 50 . What is the probability that the number of heads is between 4975 and 5050 ? (Give your answer as a decimal rounded to 4 decimal places.)

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Jason Horton

Numerade educator

The scores on an exam are normally distributed with µ = 60 and σ = 10 (generous extra credit allows scores to occasionally be above 100 ). What is the probability that a randomly selected student scores between 70 and 85 ? (Give your answer as a decimal rounded to 4 decimal places.)

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Jason Horton

Numerade educator

The daily high temperature on October 31 in a certain city is normally distributed with µ = 60 and σ = 6 . What is the probability that the high temperature on October 31 in a randomly chosen year will be between 48 degrees and 63 degrees? (Give your answer as a decimal rounded to 4 decimal places.)

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Jason Horton

Numerade educator

A tire manufacturer estimates that their tires last, an average of 30 , 000 miles, with a standard deviation of σ = 2500 . What is the probability that a randomly chosen tire from this manufacturer lasts between 35 , 000 miles and 40 , 000 miles? (Give your answer as a decimal rounded to 4 decimal places.)

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Angela Williamson

Numerade educator

tandard Thermodynamic Quantities for Selected Substances at 25 ∘C Reactant or product ΔHf∘(kJ/mol) Al(s) 0.0 Fe2O3(s) −824.2 Al2O3(s) −1675.7 Fe(s) 0.0 The thermite reaction, in which powdered aluminum reacts with iron oxide, is highly exothermic. 2Al(s)+Fe2O3(s)→Al2O3(s)+2Fe(s) Use standard enthalpies of formation to find ΔH∘rxn for the thermite reaction. Express your answer using one decimal place and include the appropriate units.

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Sydney P.