A researcher studying frogs is investigating the distance that a certain species of frog can jump. the jump lengths appear to be approximately normally distributed with a mean of 90 inches and a standard deviation of 10 inches. directions: make a sketch of the "empirical rule" for this setting. a) what proportion of frog jumps are less than 70 inches? b) what jump lengths represent the middle 95% of frog jumps? between and c) what is the probability of observing a random frog jump that is longer than 100 inches?