OA is B -The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution in each of the six regions shown. For a population of 800,000 subway riders, the numbers of subway trips taken per rider last January are approximately normally distributed with a mean of 56 trips and a standard deviation of 13 trips. Approximately how many of the riders took between 30 and 43 trips last January?
1 kilometer is equal to 1000 meters. 4000 meters is 4 times larger than 1000 meters, so 4000 meters in kilometers is going to be 4*1, which is 4 km.
No, but I think the other guys is right.
