What is the answer to 1.58x1.78=

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Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

Joe had 25 pencils he divided them into 5 pieces how many pieces does he have left