Wednesday

March 4, 2015

March 4, 2015

Posted by **MARIA** on Monday, January 9, 2012 at 10:47pm.

- statistics -
**MathGuru**, Tuesday, January 10, 2012 at 4:27pmUse z-scores.

Formula:

z = (x - mean)/sd

Find two z-scores, using 600 for x and also 900 for x. Mean = 750 and sd = 50.

Once you find the two z-scores, use a z-distribution table to determine your probability between the two z-scores.

**Answer this Question**

**Related Questions**

Stats - A new extended-life light bulb has an average service life of 750 hours...

math - 1) A light bulb producing company states that its lights will last an ...

statitics - a light bulb manufacture gaurentees that the mean life of a certain ...

Statistics - An electrical firm which manufactures a certain type of bulb wants ...

Statistics - An industrial engineer has found that the standard household light ...

statisitics - A company installs 5000 light bulbs, each with an average life of ...

sTATISTICS - If light bulbs have lives that are normally distributed with a mean...

statistics - the life of light bulbs is distributed normally. The variance of ...

statistics, help - Can someone help me which way can I approach this problem. A ...

Statistics - If light bulbs have lives that are normally distributed with a mean...