In a normal distribution, 99.7% of the data fall within how many standard
deviations of the mean?

A. Two standard deviations

B. One standard deviation
C. It cannot be determined from the given information.

D. Three standard deviations

The two-way table shows the number of people whose hobbies are reading or solving puzzles and who either ride a motorcycle or don’t ride a motorcycle. among people whose hobby is reading, what is the relative frequency of not riding a motorcycle? express your answer as a decimal, and round it to the nearest hundredth if necessary. enter your answer in the box. reading solving puzzles ride a motorcycle 7 3 don't ride a motorcycle 5 9

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

X2 + y 2 = 36 x + y = 6 solve the system of equations.