Spencer was 40 inches tall as a 4-year old which placed him in the top 10% of all children of similar age. the mean height for such children is 38 inches. based on this information, what is the standard deviation?

The 90th percentile is 1.2816 standard deviations from the mean. That tells you the standard deviation is ...

... (40 in - 38 in)/(1.2816) ≈ 1.56 in

The standard deviation for height for 4-year olds seems to be 1.56 inches.

you divide the cost ($15) by the quantity (6) to get your questions answer. the yo-yo costs $2.50. hope this : )!

step-by-step explanation:

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.