Aschool teacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 4pci/l. the school samples the air for 36 days and finds an average concentration of 4.4pci/l with a standard deviation of 1pci/l. at a 5% significance level, the critical value(s) is (are)

.19875994384

step-by-step explanation:

1699/ 8548

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.

step-by-step explanation:

what is the figure? attach a picture.

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33