Ascience teacher gives a test with 15 questions. this teacher is a hard grader. the teacher assigns points in the following manner: a correct answer =+1 point, an incorrect answer =−1 point, no answer =0 points. so scores on the test could range from +15 to −15. the teacher’s assistant calculates the standard deviation for scores on the test and reports sd =−2.3. what do we know?
- the standard deviation was calculated incorrectly.
- most students received negative scores.
- most students scored below the mean.
- there is an outlier that has a negative value close to -15.

 The standard deviation was calculated incorrectly.

Step-by-step explanation:

It cannot be negative , because it is the square root of the variance .

We add all squared deviations from the data points away from the mean and (then divide it by the number of data values) to evaluate variance.

Since , any squared number cannot give a negative result.

⇒ Standard deviation cannot be negative.

⇒The standard deviation was calculated incorrectly.

Rest other things (given in options) can not be interpreted on the basis of given information.

$3,200 x 7.25% = $3,200 x .0725 = $232 interest monthly

$232 monthly x 12 annual = $2, 784

step-by-step explanation:

f . i can go whenever i feel like it bc it is confidential meaning only i would know how much i deposited besides the bank and they wouldnt care bc when you make a deposit you are using their services which means they are using there competition and gaining more customers

and if they dont well then thats less customers for them in a less profitable way

plz mark brainliest