At a customer service call center for a large company, the number of calls received per hour is normally distributed with a mean of 70 calls and a standard deviation of 10
calls. What is the probability that during a given hour of the day there will be between
73 calls and 86 calls, to the nearest thousandth?

step-by-step explanation:

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

16 b

17 d

step-by-step explanation:

16.

amount = 3250(1.06) ^3.5 = 3985.23

17.

m = 9pn

divide both sides by 9n: -

p = m/9n