Monday

December 22, 2014

December 22, 2014

Posted by **Ashley** on Thursday, June 30, 2011 at 2:13pm.

(d) In a random sample of 55 newborn babies, what is the probability that 47% of the sample are boys. (Use 3 decimal places). Hint: you are asked to find P( < .47 ). To calculate this first find the z-score and then look up the answer in the Z table.

- statistics -
**MathGuru**, Thursday, June 30, 2011 at 5:40pmFormula for z-score:

z = (x - mean)/sd

Find mean:

mean = np = (55)(0.512) = ?

Find standard deviation:

sd = √npq = √(55)(0.512)(0.488) = ?

Note: q = 1 - p

Finish both calculations.

Substitute mean and standard deviation into the z-formula. Use 25.85 for x (0.47 * 55 = 25.85).

Once you have the z-score, use the z-table to determine your probability.

I hope this will help get you started.

- statistics -
**Ashley**, Thursday, June 30, 2011 at 8:32pmThank you sooo much!! Also thanks for posting steps and not just an answer.

**Answer this Question**

**Related Questions**

statistics - the wieights of newborn babies are distributed normally, with the ...

statistics - the weights of newborn babies are distributed normally, with the ...

math - 35 yrs ago babies are born here hospital celebrated the births of the ...

Statistics - In an analysis of test results from the YSORT gender selection ...

Statisitics:Standard Deviation of Population and o - Standard Deviation of ...

statistics - Ignoring twins and other mutiple births, assume babies born at a ...

statistics - The average weight of all newborn babies at Dearborn Hospital was ...

statistics, probability - It has been found out that the probability that a ...

math - 8) A high school graduating class is made up of 445 students. There are ...

statistics - The weight of 14 healthy newborn children was measured. The sample...