Ascientist calculated the mean and standard deviation of a data set to be and . she then found that she was missing one data value from the set. she knows that the missing data value was exactly 3 standard deviations away from the mean. what was the missing data value?
129
147
360
369

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles