Brody made 4 stacks of wooden blocks. the first stack was 7 blocks tall. the second stack was 4 blocks taller the first. the third stack was 6 blocks shorter than the second stack, and the last stack was 9 blocks taller than the third stack. how many blocks did brody use in all?

The accompanying normal probability plot was constructed from a sample of 30 readings on tension for mesh screens behind the surface of video display tubes used in computer monitors. does it appear plausible that the tension distribution is normal? the given probability is has a significant downward curve, so it is plausible that the tension distribution is normal. the given probability is has a significant downward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is plausible that the tension distribution is normal. the given probability is has a significant upward curve, so it is not plausible that the tension distribution is normal. the given probability is quite linear, so it is not plausible that the tension distribution is normal.