1. If a and b vary inversely and b = 8 when a = 6:
b = k/ a
8 = k / 6
k = 6 * 8
k = 48
Function is:
b = 48 / a
2. When a = 30:
b = 48 / 30 = 8/5
b = 1.6
Answer:16.1
Step-by-step explanation:
340 is (340-380)/20=-2, or 2 standard deviations below the mean.
420 is (420-380)/20=2, or 2 standard deviations below the mean.
95% of values lie within 2 standard deviations of the mean, so the answer is 95%.
To get 5, you will use the fraction 50/10, so since you have 57/10, you will need to subtract 7 from the 57. Have a nice day :D