How many times does the digit-5 occur in tens place in the natural number from 100 to 1000?

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

According to the data set, where should the upper quartile line of the box plot be placed?

Which of the following parabolas opens down?