Last year, deanna bought 225 lamps when customers needed 250 lamps. this year, she bought 300 lamps but only sold 200 lamps. which set of statements about the percent errors for the two years is true?

the percent error for this year was lower. deanna estimated better last year.
the percent error for this year was higher. deanna estimated better last year.
the percent error for this year was lower. deanna estimated better this year.
the percent error for this year was higher. deanna estimated better this year.

The percent error for this year was higher. Deanna estimated better last year.

Step-by-step explanation:

For last year

Expected value by Deanna=225

Accepted value by customers=250

Error=Expected value-Accepted value=225-250=-25

Percent error for last year=

For this year

Expected value by Deanna=300

Accepted value by customers=200

Error=Expected value-Accepted value=300-200=100

Percent error for this year=

We can see the percent value of this year is higher, Deanna estimated better last year.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.