Test scores were recorded for students in a statistics class. the scores for the first test had a standard deviation of 3.8 points. the scores from the second test had a standard deviation of 4.8 points. choose the correct statement below.

1. the average test grade rose by 1 point
2. the scores of the second test were closer together than the first
3. the higher standard deviation of the second test indicates higher average scores on the second test than on the first
4. none of the above are true

Step-by-step explanation:

The higher standard deviation of any data represents diversified data or data having more scattered value . Average value may be same for two samples of data having different standard deviation . So option one is incorrect. 3 rd option is also incorrect.

The scores of the second test were more widespread  than the first , because its standard deviation is more for second test. option 2 is in- correct .

none is correct.

n

step-by-step explanation:

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%