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Accrotime

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12Accrotime

is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 34 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of watch lifetimes is 5 months, and the distribution of lifetimes is normal.

(a) If Accrotime guarantees a full refund on any defective watch for 2 years after purchase, what percentage of total production will the company expect to replace? (Round your answer to two decimal places.)

A  %

(b) If Accrotime does not want to make refunds on more than 6% of the watches it makes, how long should the guarantee period be (to the nearest month)?

 B months

 
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Use modular arithmetic to determine each of the following

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Use modular arithmetic to determine each of the following. />(a) Disregarding A.M. or P.M., if it is now 1 o’clock, what time will it be 63 hours from now?_____ o’clock
(b) Disregarding A.M. or P.M., if it is now 1 o’clock, what time was it 64 hours ago? _____ o’clock

 
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Find the additive inverse and the multiplicative inverse

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Find the additive inverse and the multiplicative inverse, if it exists, of the

given number. (If an answer does not exist, enter DNE.)

2 in modulo 9 arithmetic

additive inverse   

multiplicative inverse

 
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The measure of an angle in a parallelogram

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The measure of an angle in a parallelogram that is consecutive to an angle of measure 6 degrees.

 
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