Let

denote the number of minutes spent brushing his teeth, and let

be the mean and

the standard deviation for this distribution.

The z-score corresponding to this probability is approximately

, which means

Next, (note the sign change)

The corresponding z-score is approximately

, so you have

Solving the two equations for

and

, you'll find that the mean is approximately

and the standard deviation is approximately

.
Answer:
can you put the pic of the graph plzz
Step-by-step explanation:
thx
Answer:just subtract 8 from both sids then add 17 to both then do the dam probkemits ez
Step-by-step explanation:dddddddd
Answer:
743627367867628718473867267462664772
Step-by-step explanation: