Number of hours : 1 , 1.5 , 2 , 2.5
Distance : 10 , 30 , 50 , 70
Let the total bill be x. We have:
<span>0.15x > 21 <-- Since 15% is 0.15 using inequality calc. x </span>>$140
<span>73.7 inches is 2 standard deviations above the mean of 68.9 inches. The empirical rule states that 95% of the data for a normal distribution falls within 2 standard deviations of the mean. The tails on both ends account for the remaining 5%. Symmetry of the distribution then suggests that 2.5% of men are taller than 73.7 inches.</span>
The answer would be -pd-pz = -2z+59. Unless the variable(s) is revealed.