In a normal standard curve, approximately % of scores fall within +/-2 standard deviations from the mean.

95% of scores fall within +/-2 standard deviations from the mean

Look i don’t know the answer to this but someone else will so just wait a little bit longer

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.