In an examination consisting of 4 subjects, the marks obtained by Shyam in 3 of them
are 90%, 95% and 95% respectively. Each
subject is of equal marks. Under the given
circumstances his average percentage marks
for the examination cannot be
(a) 94% (b) 90% (c) 93% (d) 96%

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?