The greatest common factor of 10 is 10 and the least common factor of 15 is 15
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Answer:
Option D) $275
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = $235
Standard Deviation, σ = $20
We are given that the distribution of amount of money spent by students is a bell shaped distribution that is a normal distribution.
Formula:

We have to find the value of x such that the probability is 0.975
Calculation the value from standard normal z table, we have,

Approximately 97.5% of the students spent below $275 on textbook.
Answer:
156
Step-by-step explanation:
( 4 / 5 )^-2 = ( 5 / 4 )^2 = 25 / 16 ;