Lena purchased a prepaid phone card for $20. long distance calls cost 21 cents a minute using this card. lena used her card only once to make a long distance
call. if the remaining credit on her card is $12.23, how many minutes did her call last?

Step-by-step explanation:

Since she used  $ 7.77

for her only call and since one call costs  $0.21 per minute, you you can compute number of minutes she spent for her last call.

How did we find $7.77:

$20-$12.23= $7.77

Now, $7.77 : $0.21= 37 minutes

Her call lasted 37 minutes

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

what are the options? ?

step-by-step explanation: