document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1050445>Question 1050445</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The lengths of a particular&#8203; animal's pregnancies are approximately normally distributed, with mean = 278 days and standard deviation = 16 days.<BR>\n" );
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document.write( "(a) What proportion of pregnancies lasts more than 290 &#8203;days?<BR>\n" );
document.write( "&#8203;(b) What proportion of pregnancies lasts between 274 and 286 days?<BR>\n" );
document.write( "&#8203;(c) What is the probability that a randomly selected pregnancy lasts no more than 258 days?<BR>\n" );
document.write( "&#8203;(d) A&#8203; \"very preterm\" baby is one whose gestation period is less than 238 days. Are very preterm babies&#8203; unusual?\r<BR>\n" );
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document.write( "How can I solve this (preferably) using a TI calculator? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #666034 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=666034\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean = 278 days and standard deviation = 16 days.<BR>\n" );
document.write( "&#8203;a) P(>290)<BR>\n" );
document.write( " TI syntax is normalcdf(smaller, larger, µ, &#963;).<BR>\n" );
document.write( "P(>290) = normalcdf(290, 9999, 278, 16) Note: Placeholder 9999<BR>\n" );
document.write( "b)P(274 &#8804; x &#8804; 286)= normalcdf(274, 286, 278, 16)<BR>\n" );
document.write( "c) P(x &#8804; 258) = normalcdf(-9999, 258, 278, 16)<BR>\n" );
document.write( "d) P(x < 238) = normalcdf(-9999, 238, 278, 16)<BR>\n" );
document.write( "Since this is a continuous function, we have P(x < 238) = P(x &#8804; 238).\r<BR>\n" );
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