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Oksana_A [137]
3 years ago
8

As part of a research project on student debt at TWU, a researcher interviewed a sample of 35 students that were chosen at rando

m concerning their monthly credit card balance. On average, these students had a balance of $2,573. The range of the data ran from a high of $22,315 to a low of $0. The median (Md) was $2,455 and the variance was $4,252. If a student selected at random had a credit card balance of $1,700; then he would have a Z Score of___________.
a. -13.4.
b. -9.73
c. 0.4
d. 9.73
Mathematics
1 answer:
Inga [223]3 years ago
6 0

Answer:

Option a is right

Step-by-step explanation:

Given that as part of a research project on student debt at TWU, a researcher interviewed a sample of 35 students that were chosen at random concerning their monthly credit card balance.

Sample average = 2573

Variance = 4252

Sample size = 35

STd deviation of X = \sqrt{4252} \\=65.21

Score of student selected at random X=1700

Corresponding Z score = \frac{1700-2573}{65.201} \\=-13.38

Rounding of we get Z score = -13.4

option a is right

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3 years ago
Solve and round answer to nearest hundredth please.
MA_775_DIABLO [31]

Answer:

Step-by-step explanation:

Solve this by using natural logs.  Taking the natural log of both sides:

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To undo the multiplication, we use addition:

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The rule says we can now bring the exponent down in front of the ln:

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Now we will subtract ln(7) from both sides:

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Now we will divide both sides by ln(16):

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(Rest assured I did the math and checked the answer and it checked out perfectly!)  I recommend you learn the laws of natural and common logs cuz they're kinda important!! :)

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