An accelerated life test on a large number of type-d alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. the distribution of the lives approximated a normal distribution. the standard deviation of the distribution was 1.2 hours. about 95% of the batteries failed between what two values?

Step-by-step explanation:

Let X be the accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed

X is NOrmal with mean =19, sigma = 1.2

For 95% critical value = ±1.96

Margin of error = ±1.96*1.2

=±2.352

Confidence interval 95% = Mean ±2.352

=(16.648, 21.352)

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation: