Answer:
95.44%
Step-by-step explanation:
Mean (m) = 48
Standard deviation (sd) = 9
n = 12
Zscore = (x - m) /sd
X = 30
Zscore = (30 - 48) / 9
Zscore = - 2
X = 66
Zscore = (66 - 48) / 9
Zscore = 2
percentage of daily phone calls numbering between 30 and 66 = P(z < 2) - p(z < - 2)
P(z < 2) = 0.9772
P(z < - 2) = 0.0228
Hence,
0.9772 - 0.0228 = 0.9544
0.9544 * 100% = 95.44
Your answer would be (b.) because -2+-3=-5
I would set up a proportion:

The proportion basically says, "if there are 5 kids meals for every 4 adult meals, that means 20 kids meals would mean x adult meals." Just cross multiply and then solve for x:

That means there are 20 kids meals sold and 16 adult meals sold, so the result is:
36 meals in total.
You take the discount then the sales tax.
Turn discount into a decimal.
25% = 0.25
Multiply.
65 * 0.25 = $16.25 (Discount)
Subtract.
65 - 16.25 = $48.75 (After discount if applied)
Now, we need to find the sales tax.
Turn sales tax into a decimal.
6% = 0.06
Multiply.
48.75 * 0.06 = 2.925
Add.
48.75 + 2.925 = 51.675
Hence, Thom doesn't have enough money to buy the radio. If he only had $50 to spend then even with the discount the radio is still more than what he intended to pay. 51.675 > 50
Hope This Helped! Good Luck!