The life of a certain type engine is normally distributed with a mean of 10 years, and a standard of 1.5 years. If one engine is randomly selected, what is the probability that the life of this engine is between 8 and 13 years

What is the parameters?

Construct the normal distribution density curve, then shade your seeking area.

Find the probability.

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music.they were asked how they like three types of music: rock, country western and jazz.the results are summarized below: no one dislikes all three types of music.six like all three types of music.eleven don’t like country western.sixteen like jazz.three like country western and jazz, but not rock.six don’t like rock.eight like rock and country western.seven don’t like jazz.how many students were surveyed?