A manufacturer claims that a new cell phone battery last 10.5 hours. A consumer agency believes that this claim is incorrect and runs a test on a sample of size 50. The sample mean is 9.6 hours with a standard deviation of 1.3 Is the company’s claim a valid one?

40% off the regular price is the correct answer.

step-by-step explanation:

d is the correct answer

step-by-step explanation:

x= 8 because 3x = 3 * 8, and 3*8 = 24

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.