Forever Power Company analysts conducted tests on the life of its batteries and those of a competitor (Brand X). They found that their batteries had a mean life (in hours) of 26.6, with a standard deviation of 4.3. Their results for a sample of 10 Brand X batteries were as follows: 13, 17, 20, 24, 26, 26, 29, 32, 34, 37.
a. Find the mean and standard deviation for the sample of Brand X batteries.
b. Which batteries have a more uniform life in hours?
c. Which batteries have the highest average life in hours?

Now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

How do you write something in scientific notation?

26) -2(7x) = (-2 • 7) x a. associative property of addition b. associative property of multiplication c. commutative property of multiplication d. commutative property of addition