The heights of a group of 1000 women are normall distributed. the mean height of the group is 170 cm with a standard deviation of 10 cm. what is the best approximation of the number of women between 170 cm and 180 cm tall?
1) 950
2) 680
3) 340
4) 170

Given a mean of 170 cm, standard deviation of 10 cm and asked for the number of women whose height is between 170 cm and 180 cm tall, we can use the probability of finding the given range and standard deviation. 180 still falls within the mean + standard deviation range. This is equal to 34 %. in  hence the answer is  3 ) 340 people