Which is better: a score of 82 on a test with a mean of 70 and a standard deviation of 8, or a score of 82 on a test with a mean of 75 and a standard deviation of 4?

A score of 82 on a test with a mean of 75 and a standard deviation of 4 is better.

Step-by-step explanation:

We are given two situations;

A score of 82 on a test with a mean of 70 and a standard deviation of 8 or

A score of 82 on a test with a mean of 75 and a standard deviation of 4.

Now, we have to find which is better. For this we will calculate z score for both the situations;

The z score value is given by, Z = ; where, = mean

                                                                              = standard deviation

For 1st situation; z score = = 1.50

For 2nd situation; z score = = 1.75

So, it is clear that 2nd situation is better as it has higher z score.

Therefore, a score of 82 on a test with a mean of 75 and a standard deviation of 4 is better.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.