class                             cumulative
relative frequency

150 up to
200                    
0.18

200 up to
250                    
0.21

250 up to
300                    
0.61

300 up to
350                    
1.00

a-1: Construct a relative frewquency distribution. (round your
answer to 2 decimal places)

class                           
relative frequency

150 up to
200                    
________

200 up to
250                    
________

250 up to
300                    
________

300 up to
350                    
________

total                                   
_________

a-2: What percent of the observations are at least 250 but less
than 300?

percent of observations   _______