To be able to say with 95% confidence level that the standard deviation of a data set is within 20% of the population's standard deviation, the number of observations within the data set must be greater than or equal to what quantity? 210 250 84 48

c

c

c

c

c

c

c

cc

c

step-by-step explanation:

is there any photos or whatever?

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

the first option i believe

step-by-step explanation: