The Water Department checks the city water suppy on a regular basis for contaminants such as lead. The water department takes 200 samoles and estimates that the concentration of lead in your drinking water is3.2 ppb, with a standard deviation of 0.3 ppb. Assuming the samples were random and unbiased, how much confidence can you have in this data?

-6 is the correct option from the above given options

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2