Use the following to answer questions :
A consume researcher inspects 300 batteries manufactured by two companies for being good or defective.The following table gives the two-way classification of these 300 batteries.

-If the researcher selects one battery at random from these 300 batteries,the probability (rounded to three decimal places)that this battery is good or made by company B is

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Use the following to answer questions :
A consume researcher inspects 300 batteries manufactured by two companies for being good or defective.The following table gives the two-way classification of these 300 batteries.
 
-If the researcher selects one battery at random from these 300 batteries,the probability (rounded to three decimal places)that this battery is good or made by company B is

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The Answer of Use the following to answer questions :
A consume researcher inspects 300 batteries manufactured by two companies for being good or defective.The following table gives the two-way classification of these 300 batteries.
 
-If the researcher selects one battery at random from these 300 batteries,the probability (rounded to three decimal places)that this battery is good or made by company B is

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